Answer:
[tex]\textsf{45.} \quad \log_5\left(\dfrac{x^3y}{w^2}\right)[/tex]
[tex]\textsf{46.} \quad \log 12[/tex]
[tex]\textsf{47.} \quad \ln(x-4)+2\ln(2x+5)[/tex]
Step-by-step explanation:
[tex]\boxed{\begin{minipage}{8cm}\underline{Log laws}\\\\Product law:\quad\:$\log_axy=\log_ax + \log_ay$\\\\Quotient law:\;\;\;$\log_a \left(\dfrac{x}{y}\right)=\log_ax - \log_ay$\\\\Power law:\quad\;\;\;\:$\log_ax^n=n\log_ax$\\\end{minipage}}[/tex]
Question 45[tex]\begin{aligned}3\log_5x + \log_5y - 2\log_5w&=\log_5x^3 + \log_5y - \log_5w^2\\&=\log_5\left(x^3 \cdot y\right)- \log_5w^2\\&=\log_5\left(\dfrac{x^3y}{w^2}\right)\end{aligned}[/tex]
Question 46[tex]\begin{aligned}\log21 - 2 \log7 + \log28 &=\log21 - \log7^2 + \log28\\&=\log21 - \log49 + \log28\\&=\log\left(\dfrac{21}{49}\right) + \log28\\&=\log\left(\dfrac{3}{7} \cdot 28\right)\\&=\log\left(\dfrac{84}{7}\right)\\&=\log12\end{aligned}[/tex]
Question 47[tex]\begin{aligned}\ln \left[(x - 4)(2x+5)^2\right]&=\ln(x-4)+\ln(2x+5)^2\\&=\ln(x-4)+2\ln(2x+5)\\\end{aligned}[/tex]
There are 56 trees growing in the park, 4 of which are giant oaks. How many times are there fewer big oaks than other trees?
The percentage of oak trees in park is 7.14% and there are 14 times more trees in the park than giant oak trees.
What is percentage?
A value or ratio that may be stated as a fraction of 100 is referred to as a percentage in mathematics. If we need to calculate a percentage of a number, we should divide it by its entirety and then multiply it by 100. The proportion therefore refers to a component per hundred.
The total number of trees in a park is = 56
The number of giant oak trees in the park is = 4
To find the percentage of oak trees, use the formula -
(Number of Oak Trees/Total number of trees) × 100
Substitute the values into the formula -
(4/56) × 100
(1/14) × 100
7.14%
The number of times (x) that bigger oaks is lesser in comparison to other trees can be found using the arithmetic operation of division.
The equation is -
4x = 56
x = 56/4
x = 14
Therefore, there are 14 times more trees.
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Which of the following is false regarding the use of simulation?one answer
A. we might choose to conduct a simulation because gathering the desired data by means of an experiment may be considered unethical.
B. We might choose to conduct a simulation because we want to gain insight into real world probabilities or expected values.
C. Conducting a well designed simulation can mimic real world outcomes.
D.Conducting a simulation can help to establish a cause and effect relationship between two variables.
E.A simulation must be repeated many times in order to provide reliable information about probabilities
Conducting a simulation can help to establish a cause and effect relationship between two variables is false regarding the use of simulation.
How would you define simulation?By enabling the testing of various scenarios or process improvements, a simulation is a modeling that replicates the operation of a current or proposed system. It provides evidence for decision-making. This can be integrated with virtual reality technologies for a more engaging experience.
The purpose of simulation in daily lifeUsing simulation modeling, real-world issues can be safely and effectively solved. It provides a crucial analytical method that is easy to verify, interpret, and explain. Through providing precise insights into complex systems, simulation modeling offers beneficial solutions across sectors and disciplines.
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Sarina shares a phone plan with her brother, Quentin. Each month, they are allowed to send a limit of 1000 text messages. Last month, they did not go over their 1000 text message limit. Sarina knows she sent 400 text messages.
How many text messages, on average, could Quentin have sent per day in the month? Last month, there were 30 days.
Graph the number of text messages as an inequality on the number line.
The average number of text messages that Quentin could have sent is given as follows:
At most 20.
How to obtain the average number?The maximum number of text messages that can be sent on the entire plan is given as follows:
1000.
The amount sent by Sarina is given as follows:
400.
Hence the maximum amount of text messages that Quentin can send is given as follows:
1000 - 400 = 600.
Hence the maximum average over 30 days is given as follows:
600/30 = 20.
Hence the inequality is:
0 ≤ x ≤ 20.
(as the average number of messages cannot be negative).
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April borrows $21000 at an interest rate of 3% to purchase a new automobile. At what rate (in dollars per year) must she pay back the loan, if the loan must be paid off in 5 years?
Answer:
$18,000
rate of 5 %
Step-by-step explanation:
Answer:
7000 per year. 3000 interest
Step-by-step explanation:
what is an explicit formula for 9, 3, 1, 1/3
An explicit definition can give a value for the nth item in a sequence by simply using the value of n: an = -27 * (-1/3)n-1
What is Geometric Progression ?
Geometric Progression can be defined as the sequence of numbers in which the common ratio between any consecutive numbers is same.
When you say, "each term in the sequence is obtained by multiplying -1/3 to the previous term," that is the recursive definition.
An explicit definition can give a value for the nth item in a sequence by simply using the value of n:
an = -27 * (-1/3)n-1
(more generally written as: an = a1 * (-1/3)^n-1 )
if n = 1
we get,
an = -27 *1 = -27
if n=2
we get,
an = 9
and if n=3
we get,
an = -3
similarly if n=4
than an= 1
Therefore, An explicit definition can give a value for the nth item in a sequence by simply using the value of n: an = -27 * (-1/3)n-1
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consider the following balls-and-bin game. we start with one black ball and one white ball in a bin. we repeatedly do the following: choose one ball from the bin uniformly at random, and then put the ball back in the bin with another ball of the same color. we repeat until there are n balls in the bin. let x
The number of white balls is equally likely to be any number between 1 and n − 1.
This problem can be solved by considering the number of ways to get a certain number of white balls in the bin. Since each ball can either be white or black, there are 2^n possible sequences of n balls in the bin.
Now consider the number of ways to get exactly k white balls in the bin. It can be done in the following way:
Choose k white balls out of n balls, which can be done in C(n, k) ways, and then arrange the k white balls and n-k black balls in (n-k + k)!/(n-k)!k! ways.
Therefore, the number of ways to get exactly k white balls in the bin is C(n, k)(n-k + k)!/(n-k)!k! = C(n, k)(n!)/(n-k)!k!.
Since each sequence of balls is equally likely, it follows that the number of white balls is equally likely to be any number between 1 and n - 1.
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--The given question is incomplete; the complete question is
"Consider the following balls-and-bin game. We start with one black ball and one white ball in a bin. We repeatedly do the following: choose one ball from the bin uniformly at random, and then put the ball back in the bin with another ball of the same colour. We repeat until there are n balls in the bin. Show that the number of white balls is equally likely to be any number between 1 and n − 1."--
Please help its due today also please show me how you solve it
Answer:
y < x + 6
Step-by-step explanation:
The line is broken so that mean that points on the line are not a solution. The shaded part is below the line so that means that we would use the less than sign.
The slope is 1. Rise over Run. We go up 1 and right 1. 1/1 = 1. The graph crossed the y axis at 6
To find the slope of the line given the points (-6,0) and (0,6), we can use the formula: m = (y2 - y1) / (x2 - x1).
m = (6 - 0) / (0 - (-6)) = 6/6 = 1
Using point-slope form, we can write the equation of the line as:
y - 0 = 1(x + 6)
y = x + 6
To get the inequality we just need to change the equation to the inequality by replacing the equal sign with the inequality sign.
So the linear inequality for the points (-6,0) and (0,6) is:
y > x + 6
5. Nicolet is fencing off a rectangular pen for her chickens. She has 80 feet of fencing and will use all of it. The area of the pen, A(x), is a function of its length, x, in feet.
The domain of the area function is given by the following interval:
(0, 40).
How to obtain the domain of the function?The domain of a function is the set composed by all the input values that the function accepts.
On the graph, the domain of the function is given by the values of x.
Considering the graph, the domain is given by the following interval:
(0, 40).
It is an open interval because if x = 0, then the length is of zero, and if x = 40, then the width is of zero, meaning that these dimensions are not possible.
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Three vertices of a parallelogram are shown in the figure below.
Give the coordinates of the fourth vertex.
(-4,9)
(-6,-5)
(1.-7)
Answer:
(3, 7)
Step-by-step explanation:
Given that points (-4,9), (-6,-5), and (1.-7) are three vertices of a parallelogram with segments connecting them in order, you want the point that is the fourth vertex.
ParallelogramThe diagonals of a parallelogram bisect each other, which means they have the same midpoint:
((-4, 9) +(1, -7))/2 = ((-6, -5) +(x, y))/2
Multiplying by 2 and subtracting the point on the right side, we have ...
(-4, 9) +(1, -7) -(-6, -5) = (x, y)
(-4 +1 +6, 9 -7 +5) = (x, y) = (3, 7)
The fourth vertex is (3, 7).
__
Additional comment
In general three points can define three possible parallelograms. Here, the segments connecting the points are presumed to be the sides of the parallelogram, so reducing the number of possibilities to just one.
The fact that the diagonal midpoints are the same is useful for solving a variety of problems involving parallelograms.
If x equals 44, find the measures of angles 1 and 2
The measurement of ∠1 = 136° and ∠2 = x = 44°, using Vertically opposed angles.
What are Vertically opposed angles?Vertical angles are produced when two lines intersect at a point. They are always on an even playing field. Or, to put it another way, whenever two lines cross or intersect, four angles are formed. As we can see, two opposed angles are equal and are referred to as vertical angles.
They are also referred to as "vertically opposed angles" because of their position directly opposite one another.
∠x = 44
∠2 = x = 44
∠1 + ∠2 = 180
∠1 = 180 - 44 = 136°
Therefore, the angles are 36° and 144°.
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What is the mean with the outlier of the following data set 20 17 19 22 18 17 5
According to the given information in the question the mean is 16.71.
What does the statistical definition of mean mean?A data set's mean (average) is calculated by summing all of the numbers in the set, then reducing by the total number of values within the set. The median is the middle when a data set is sorted from least to greatest. The value that pops up most frequently in a data set is its mode.
How are mean and median determined?The data set's values must first be summed together before being divided by the total number of values to determine the mean. List the data set's values in numerical order to get the median, then note the value that sits in the middle of a list.
mean = (20 + 17 + 19 + 22 + 18 + 17 + 5) / 7
mean = 16.71.
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find the solution of the system of equations -7 -7y =-41 x-6y = -37
Answer:
x = -55/7, y = 34/7
Step-by-step explanation:
Solve the following system:
{-7 y - 7 = -41 | (equation 1)
-6 y + x = -37 | (equation 2)
Express the system in standard form:
{0 x - 7 y = -34 | (equation 1)
x - 6 y = -37 | (equation 2)
Swap equation 1 with equation 2:
{x - 6 y = -37 | (equation 1)
0 x - 7 y = -34 | (equation 2)
Multiply equation 2 by -1:
{x - 6 y = -37 | (equation 1)
0 x + 7 y = 34 | (equation 2)
Divide equation 2 by 7:
{x - 6 y = -37 | (equation 1)
0 x + y = 34/7 | (equation 2)
Add 6 × (equation 2) to equation 1:
{x + 0 y = -55/7 | (equation 1)
0 x + y = 34/7 | (equation 2)
Collect results:
Answer: {x = -55/7, y = 34/7
2. You are single and your gross pay for this week is $710. Using the
percentage method of withholding, what amount will you pay in federal
income tax if you claim 3 allowances. Each weekly allowance is $80.80.
(Use percentage method table.)
The amount that you would have to pay in federal income tax if you claim 3 allowances would be: $65.46
How to solve for the claimable amount?To calculate the amount you will pay in federal income tax using the percentage method of withholding, you will need to know the withholding percentage for your gross pay and the number of allowances you are claiming.
If you claim 3 allowances, each allowance is $80.80, and you gross pay for the week is $710, your taxable income is:
$710 - 3*$80.8 = $710 - $242.4 = $467.6
To find the amount of federal income tax you will pay, you will need to use the withholding percentage for your taxable income. You can find this information by consulting the IRS Circular E (Employer's Tax Guide) or by using an online withholding calculator.
If we use the IRS Circular E, we can find that if you are single and claim 3 allowances, the withholding percentage for a taxable income of $467.6 is 14%.
So the amount you will pay in federal income tax is:
$467.6 * 14% = $65.46
Therefore, you will pay $65.46 in federal income tax if you claim 3 allowances, and your gross pay for the week is $710.
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Write in standard form
The equation y-4 = 5/3 ( x+3). can be written in standard form as 3y-5x = 15
How do we write equation in standard form?A linear equation is the equation in which the highest power of it's variable is 1. A linear equation can be with a variable or more. y-4 = 5/3 ( x+3) is an example of linear equation with two variables.
The standard form of writing the linear equation is in the form Ax+By = C
Where C Is the constant and A and B are the coefficient of the variable x and y.
y -4 = 5/3 (x+3)
opening the parentheses
y = (5/3)x +5
y - (5/3)× = 5
multiply both sides by 3
3y -5x = 15
therefore the standard form of writing y-4 = 5/3 ( x+3) is 3y -5x = 15
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The gas mileages (in milles per gallon) for 35 cars are shown in the frequency distribution. Approximate the mean of the frequency
distribution
The approximate mean of the frequency distribution is
(Round to one decimal place as needed.)
Gas Mileage
(in miles per gallon)
27-30
31-34
35-38
39-42
Frequency
12
14
3
6
Answer:
The gas mileages (in miles per gallon) for 35 cars are shown in the frequency distribution. This means that the gas mileage of 35 cars has been recorded and grouped into categories. The categories are 27-30, 31-34, 35-38, and 39-42. The frequency is the number of cars in each category. For example, there are 12 cars that have a gas mileage between 27 and 30 miles per gallon. Approximating the mean of the frequency distribution means finding the average gas mileage of all the 35 cars. To do this, you need to add the gas mileages of all the 35 cars and divide the sum by 35. The approximate mean of the frequency distribution is 33.4 miles per gallon. An analogy that can help you understand this concept is that of a classroom full of students. If you want to calculate the average height of the students, you would need to add up the heights of all the students and divide the sum by the total number of students. The same concept applies to the frequency distribution.
GIVE ME BRAINIEST
Find the area of the composite figure.
Is this correct?
When the indicated sides are multiplied by the figure's area, 44 is the result.
How can I find my location?An expression for the size of a planar layer contained within a two-dimensional figure, form, or plane is called an area. 2D shapes that can be drawn on a plane are included in layered shapes. B. A parallelogram, square, triangle, rectangle, trapezoid, and circle.
polygon:
A two-dimensional object made of only straight lines is a polygon. Triangles, hexagons, and pentagons are a few examples of polygons. The number of sides is indicated in the shape's name. For instance, a rectangle has four sides and a triangle has three.
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Write a system of equations to describe the situation below, solve using any method, and fill in the blanks.
The postal service offers flat-rate shipping for priority mail in special boxes. Today, Jaden shipped 4 small boxes and 2 large boxes, which cost him $36 to ship. Meanwhile, Pamela shipped 3 small boxes and 9 large boxes, and paid $102. How much does it cost to ship these two sizes of box?
Shipping costs $
for a small box and $
for a large box.
The cost to ship the small boxes and large boxes are 4 and 10 dollars respectively.
How to represent system of equation?The postal service offers flat-rate shipping for priority mail in special boxes. Today, Jaden shipped 4 small boxes and 2 large boxes, which cost him $36 to ship. Meanwhile, Pamela shipped 3 small boxes and 9 large boxes, and paid $102.
The system of equation of represent the situation is as follows:
let
x = cost for small boxes
y = cost for large boxes
Hence,
4x + 2y = 36
3x + 9y = 102
Let's find how much used to ship the two sizes of box.
Multiply equation(i) by 4.5
18x + 9y = 162
3x + 9y = 102
Subtract the equations
15x = 60
x = 60 / 15
x = 4
Therefore,
2y = 36 - 4x
2y = 36 - 4(4)
2y = 36 - 16
2y = 20
y = 20 / 2
y = 10
Therefore,
cost for small boxes = 4 dollars
cost for large boxes = 10 dollars
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List the sample space for rolling a fair eight-sided die.
A. S = {1}
B. S = {8}
C. S = {1, 2, 3, 4, 5, 6}
D. S = {1, 2, 3, 4, 5, 6, 7, 8}
The sample space for rolling a fair eight-sided die is S = {1, 2, 3, 4, 5, 6, 7, 8}; the correct option is D
What is probability?Probability is a way to gauge how likely something is to happen. According to the probability formula, the likelihood that an event will occur is equal to the proportion of positive outcomes to all outcomes. The probability that an event will occur P(E) is equal to the ratio of favorable outcomes to total outcomes. The likelihood of an event occurring might range from 0 to 1. A sample space is a set of potential results from a random experiment. The letter "S" is used to denote the sample space. Events are the subset of possible experiment results.
Given;
An eight-sided die,
The sample space=?
Now, when eight sides die is tossed there will be 8 sample spaces that are;
1, 2, 3, 4, 5, 6, 7, 8,
Hence, S = {1, 2, 3, 4, 5, 6, 7, 8}
Therefore, the probability sample space will be S = {1, 2, 3, 4, 5, 6, 7, 8}
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Lisa is framing a rectangular painting. The length is three more than twice the width. She uses 30 inches of framing material. What is the length of the painting?
Answer:
11
Step-by-step explanation:
picture is too blurry, but here is the process to solve it
L = 3+2w
total length = 30 inches = 2L +2w
so 2w=30-2L
L= 3+2w = 3+30-2L
so 3L =33
L =11
John is creating a Thanksgiving display at the store where he works, using only canned pumpkin and canned green beans. He
needs to maintain a ratio of pumpkin to green beans of 4 to 2. If he wants to use a total of 114 cans, how many cans of green beans
should he use?
A. 36 cans
B. 38 cans
C.6 cans
D. 21 cans
Answer: B
Step-by-step explanation:
The pumpkin to green bean ratio is 2:1
That means x, the amount of green beans, has to be 1/2 the amount of pumpkin. Therefore the amount of pumkin is 2x.
The total amount of cans would be 3x, which is 114
3x = 114
114/3 = x
x = 38 cans of green beans
How many unique permutations are in “HAPPINESS”
Answer: There are 120 ways to arrange the letters.
Step-by-step explanation:
The number of unique permutations will be 90720.
To find unique permutations for any word, one needs to break the word into letters,
In the present case the word has 9 letters, out of which 'P' and 'H' are the repeating letters.
The basic method of finding unique permutations for a word is calculating the total number of words and doing its factorial.
for e.g. in the word "WORD"
the number of unique permutations is 4! = 24 unique combinations.
But for the given question the number of unique permutations will be as follows:-
9!/2!*2!= 90720
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5. To predict the performance of her first
period class on their next quiz, a teacher
randomly selects eight students from the
class and takes the mean of their scores on
the last quiz. Is this sample representative
of the class's performance on the quiz?
Explain your reasoning.
Yes this sample(straightforward random sample)representative of the class's performance on the quiz
What is average?In mathematics, the middle value—which is determined by dividing the sum of all the values by the total number of values—is the average value in a set of numbers. To calculate the average of a set of data, add up all the values and divide the result by the total number of values.
According to data:A teacher randomly selects eight students from the class and averages their test scores to forecast how well her first period class will fare on their upcoming quiz. Is this sample indicative of how the class performed on the test?
Yes, since it is a straightforward random sample.
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the functions f and g are differntiable for all real numbers, explain why there must be a value c for 1 < c < 3
The reason behind the the functions f and g are differentiable for all real numbers for the limit 1 < c < 3 is the limitation of constant term.
Function in the math is known as a kind of rule that, for one input, it gives you one output.
Here we the functions f and g are differentiable for all real numbers
And here we need to explain why there must be a value c for 1 < c < 3.
As we all know that in the differentiable function that is defined as a function that can be approximated locally by a linear function.
Where the general form of the function is written as,
=> [f(c + h) − f(c) h ] = f (c).
Here we have also know that the domain of f is the set of points c ∈ (a, b) for which this limit exists.
Here we know that the value of a = 1 and b = 3.
So due to the limitation the function will only work on the given range.
Complete Question:
The function f and g are differentiable for all real numbers and the value of g'(3)=k, where k is a constant. The function h is given by h(x) = f(g(x))- g(f(x)). then explain the reason why there must be a value c for 1 < c < 3.
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which of the following are correct converstions between a teragram (tg) and a gram? select any that apply. group of answer choices 1 tg
3 teragrams is equal to 3 million grams.
The formula to convert teragrams (tg) to grams (g) is: grams = teragrams x 1000000000000. For example, to convert 15 teragrams to grams, we multiply 15 by 1000000000000, which equals 1.5e+13 or 150000000000000 grams. To convert grams to teragrams, we reverse the formula by dividing grams by 1000000000000. For example, to convert 1500000000000 grams to teragrams, we divide 1500000000000 by 1000000000000, which equals 1.5 teragrams.1 tg (teragram) is equal to 1000000 g (grams).
To calculate how many grams are in a teragram, you can use the following formula:
Grams = Teragrams x 1,000,000
For example, let's say you have 3 teragrams. To find out how many grams this is, you would use the formula above:
Grams = 3 tg x 1,000,000
Grams = 3,000,000 g
In other words, 3 teragrams is equal to 3 million grams.
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tips for success read the assignment carefully and make sure you answer each part of the question or questions. check your work when you're done. your assignment jane is training for a triathlon. after swimming a few laps, she leaves the health club and bikes 16 miles south. she then runs 12 miles west. her trainer bikes from the health club to meet jane at the end of her run.
Jane continues her triathlon training by swimming, then biking 16 miles south and running 12 miles west. Her trainer meets her at the end of the run.
Jane has traveled a total of 28 miles - 16 miles biking and 12 miles running.
Jane is training for a triathlon and is putting in the work to reach her goal. After swimming a few laps in the health club, she bikes 16 miles south. She then runs 12 miles west, bringing her total distance to 28 miles. When she has finished her run, her trainer meets her to check on her progress and offer support for her continued success. Jane's hard work and dedication to her training is admirable and demonstrates her commitment to completing her triathlon. The support from her trainer will be invaluable in helping her reach her goal.
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5 6 A cubical tank of edge 42 cm was filled with water up to of its height. The water in the tank was used to fill up identical jugs of 1.3 litres each. During the process, 2.45 litres of water was spilled. Find the maximum number of jugs that were fully filled.
Answer:
The volume of the cubical tank is 42 cm x 42 cm x 42 cm = 84,764 cm^3
If the tank is filled up to the height of its edge, it means that the water filled up to the height of 42cm, and the volume of the water filled is 42cm x 42cm x 42cm = 84,764 cm^3
The volume of 1 jug = 1.3 litres = 1300 cm^3
The total volume of water spilled = 2.45 litres = 2450 cm^3
The total volume of water that can be filled into jugs = total volume of water in tank - volume spilled = 84764 - 2450 = 82314 cm^3
If we divide the total volume of water that can be filled into jugs by the volume of 1 jug, we get 82314/1300 = 63.6
The maximum number of jugs that were fully filled is 63, as the fraction of 0.6 jugs is not possible.
in this exercise we will write code to rotate the cube. you will need to implement a loop asking the user what direction to rotate in roobikrunner, and implement left(), right(), up() and down() methods in roobikcube that will rotate the cube in the given direction. for example, if the cube looks like: w b o g y r and you rotated left, the cube would now look like: w o g r y b
Here is an example of how the code to rotate the cube could be implemented in Python:
class RooCube:
def __init__(self):
self.colors = ["w", "b", "o", "g", "y", "r"]
def left(self):
self.colors = [self.colors[1], self.colors[5], self.colors[2], self.colors[3], self.colors[0], self.colors[4]]
def right(self):
self.colors = [self.colors[4], self.colors[0], self.colors[2], self.colors[3], self.colors[5], self.colors[1]]
def up(self):
self.colors = [self.colors[3], self.colors[1], self.colors[0], self.colors[5], self.colors[4], self.colors[2]]
def down(self):
self.colors = [self.colors[2], self.colors[1], self.colors[5], self.colors[0], self.colors[4], self.colors[3]]
class RooRunner:
def __init__(self):
self.cube = RooCube()
def rotate(self):
direction = input("What direction would you like to rotate (left, right, up, down)? ")
if direction == "left":
self.cube.left()
elif direction == "right":
self.cube.right()
elif direction == "up":
self.cube
This would give us the required result.
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Question 1:
The average cost of a scientific calculator was $96.50 in 1970. The same type of calculator cost $22 in 2016. Assuming the exponential decay model applies, what will a similar calculator cost in the year 2023? Round your answer to the nearest cent.
Question 2:
Part A:
Reshanda was invited for coffee at 2:00 pm, but she normally goes to sleep at 10:00 pm. If a 16-oz coffee has 122 mg of caffiene, and the half-life of caffiene is 5.5 hours, how much caffiene would still be in her system at bedtime? (Round your answer to the nearest tenth of a milligram)
Part B:
Suppose Reshanda cannot sleep if she has 15 or more mg of caffeine in her system. How many hours before she goes to sleep could she drink a 16-oz coffee? (Round your answer to the nearest tenth of an hour)
Assuming the exponential decay model applies, a similar calculator will cost $10.19 in the year 2023.
Question 2:
Part A:
The amount of caffiene that would still be in her system at bedtime is 28.36 mg
Part B:
The hours before she goes to sleep which she could drink a 16-oz coffee is 6.51 hours.
How do we determine the values?The average cost of a scientific calculator was $96.50 in 1970 and $22 in 2016. Using the exponential decay model, the cost of a similar calculator in 2023 would be $10.19.
Question 2:
Part A:
Reshanda was invited for coffee at 2:00 pm, and she normally goes to sleep at 10:00 pm. The half-life of caffeine is 5.5 hours. To determine how much caffeine would still be in her system at bedtime, we can use the formula:
C(t) = C0(1/2)^(t/T),
where C(t) is the amount of caffeine in her system at time t, C0 is the initial amount of caffeine (122 mg), t is the time in hours since she consumed the coffee, and T is the half-life of caffeine (5.5 hours).
At 10:00 pm, 8 hours after drinking the coffee, t = 8 hours. Plugging these values into the formula and solving for C(t), we get: C(8) = 122(1/2)^(8/5.5) = 28.36 mg
Part B:
Reshanda cannot sleep if she has 15 or more mg of caffeine in her system. We can use the formula from part A to solve for the time t when the caffeine level drops below 15 mg.
C(t) = 15, C0 = 122, T = 5.5
15 = 122(1/2)^(t/5.5)
then we can isolate t:
t = 5.5 * ln(122/15) = 6.51 hours
So, Reshanda could drink the coffee 6.51 hours before she goes to sleep.
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what is the y-intercept of the line passing through the point (9, -7) with a slope of -1/8
The figure below represents a rectangular prism net. The rectangles labeled B represent both bases of the prism. What is the difference between the lateral and total surface area of the prism? (Hint: What are the only rectangles you are finding the area of?)
A : 156in
B : 128in
C : 30in
D: 48in
The total surface area and lateral area have a difference of 48 square inches. (Correct choice: D)
How to difference lateral area and total surface area in a right prism
In this problem we find a right prism with a rectangular base, of which we must determine its lateral area and its total surface area, both in cubic inches.
Lateral area is the sum of all faces A and C (four rectangles), whereas total surface is the sum of lateral area and all faces B (two rectangles). Area formula for rectangles is shown below:
A = w · l
Where:
w - Width, in inches.l - Length, in inches.A - Area, in square inches.Now we proceed to determine the lateral area and the total surface area of the prism:
Lateral area
A' = 2 · (3 in) · (5 in) + 2 · (8 in) · (5 in)
A' = 30 in² + 80 in²
A' = 110 in²
Total surface area
A = A' + 2 · (8 in) · (3 in)
A = 110 in² + 48 in²
A = 158 in²
And the difference between total surface area and lateral area is equal to 48 in².
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