Which are correct representations of the inequality –3(2x – 5) < 5(2 – x)? Select two options. x < 5 –6x – 5 < 10 – x –6x + 15 < 10 – 5x A number line from negative 3 to 3 in increments of 1. An open circle is at 5 and a bold line starts at 5 and is pointing to the right. A number line from negative 3 to 3 in increments of 1. An open circle is at negative 5 and a bold line starts at negative 5 and is pointing to the left.
Answers
An open circle is at 5 and a bold line starts at 5 and is pointing to the right. Therefore, option B is the correct answer.
What are inequalities?Inequalities are the mathematical expressions in which both sides are not equal. In inequality, unlike in equations, we compare two values. The equal sign in between is replaced by less than (or less than or equal to), greater than (or greater than or equal to), or not equal to sign.
The given inequality is -3(2x - 5) < 5(2 - x).
Here, -6x+15<10-5x
Add 5x on both the sides of an inequality, we get
-x+15<10
Subtract 15 on both the sides of an inequality, we get
-x<10-15
-x<-5
Multiply -1 on both the sides of an inequality, we get
x>5
Therefore, option B is the correct answer.
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Related Questions
the twenty-third term in an arithmetic sequence is $\frac23$ and the fifty-third term in the sequence is $\frac32$. what is the thirty-fifth term?
Answers
The thirty-fifth term in an arithmetic sequence is 1.
The formula for the nth term of an arithmetic sequence is:
[tex]t_{n}[/tex] = a + (n - 1)d
The twenty-third term in an arithmetic sequence is [tex]$\frac{2}{3}[/tex].
a + 22d = [tex]$\frac{2}{3}[/tex] ...... (1)
The fifty-third term in an arithmetic sequence is [tex]$\frac{3}{2}[/tex].
a + 52d = [tex]$\frac{3}{2}[/tex]........(2)
Subtracting both the equations.
Subtract equation (1) from equation (2):
a + 52d - (a + 22d) = [tex]$\frac{3}{2} - \frac{2}{3}[/tex]
a + 52d - a - 22d = [tex]$\frac{9-4}{6}[/tex]
30d = [tex]$\frac{5}{6}[/tex]
d = [tex]$\frac{1}{36}[/tex]
Substitute the value of d in equation (1).
We get:
a + 22[tex]$(\frac{1}{36})[/tex] = [tex]$\frac{2}{3}[/tex]
a + [tex]$\frac{11}{18}[/tex] = [tex]$\frac{2}{3}[/tex]
a = [tex]$\frac{2}{3}[/tex] - [tex]$\frac{11}{18}[/tex]
a = [tex]$\frac{12}{18} - \frac{11}{18}[/tex]
a = [tex]$\frac{1}{18}[/tex]
To find the 35th term substitute the values of a and d in the nth term equation.
The thirty-fifth term in an arithmetic sequence is:
= [tex]$\frac{1}{18}[/tex] + (35 - 1) [tex]$\frac{1}{36}[/tex]
= [tex]$\frac{1}{18}[/tex] + [tex]$\frac{34}{36}[/tex]
= [tex]$\frac{1}{18}[/tex] + [tex]$\frac{17}{18}[/tex]
= [tex]$\frac{18}{18}[/tex]
= 1
Therefore the thirty-fifth term is 1.
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the london school of economics and the harvard business school have conducted studies of how chief executive officers (ceos) spend their time. these studies have found that ceos spend many hours per week in meetings that include conference calls, business meals, and public events. suppose that the data below show the time spent per week in meetings (hours) for a sample of 25 ceos. 14 15 18 23 15 19 20 13 15 23 23 21 15 20 21 16 15 18 18 19 19 22 23 21 12 (a) what is the least amount of time spent per week on meetings?
Answers
The least amount of time spent per week on meetings for the sample of 25 CEOs is 12 hours.
The least amount of time spent per week on meetings for the sample of 25 CEOs can be found by looking at the lowest value in the data set. The data set provided above lists the time spent per week on meetings for a sample of 25 CEOs, and the least amount of time spent is 12 hours per week.
This is the smallest value in the data set, and it represents the minimum amount of time spent on meetings among the CEOs in the sample.
Note that this data is a sample of 25 CEOs and not the entire population of CEOs, so it is not representative of all CEOs. Additionally, the time spent per week on meetings is a quantitative variable, and it is continuous. Therefore, it is recommended to use measures of central tendency (mean or median) and measures of dispersion (standard deviation, range) to make inferences about the population.
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32 to 28 decrease percentage
Answers
Answer:
Step-by-step explanation:
To calculate a percentage decrease, first calculate the difference (decrease) between the two numbers you are comparing. Next, divide the decrease by the original number and multiply the answer by 100.
In this case, our difference is 32-28=4
4 divided by 32= 4/32, and multiplying by 100 gives us 400/32=12.5
Therefore, the percent decrease is 12.5%
the lifetime of a certain brand of car battery has an exponential distribution with a mean of 60 months. find the probability that a randomly selected battery of this kind lasts longer than 70 months (round off to second decimal place).
Answers
The probability that a randomly selected battery of this kind lasts longer than 70 months is approximately 0.104(rounded off to the second decimal place).
The cumulative distribution function of an exponential distribution with a mean of 60 months is given by:
F(x) = 1 - e^(-x/60)
The probability that a randomly selected battery lasts longer than 70 months is given by:
P(X > 70) = 1 - F(70) = 1 - (1 - e^(-70/60)) = e^(-70/60) = 0.104
So, the probability that a randomly selected battery of this kind lasts longer than 70 months is approximately 0.104 (rounded off to the second decimal place).
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7) Graph the systems of linear equations on your calculator
Answers
SOMEONE PLS HELP TYSM
Answers
The median of the given set of numbers is 82.
What is Median?Median is the middle element when the data set is arranged in an increasing or decreasing order.
Given is a stem and leaf plot.
We have to write each of the corresponding number in stem attached with each of the corresponding number in leaf plot.
So the numbers in the first row will be 71, 75, 77 and 78.
Numbers in the second row will be 80, 80, 81, 82, 84, 85, 86, 86, 87, 89.
Number in the third row will be 95.
Writing the numbers from the plot, we will get the values as,
71, 75, 77, 78, 80, 80, 81, 82, 84, 85, 86, 86, 87, 89, 95.
The numbers are already in the increasing order.
There are 15 number of data in the set.
Median is the middle element, that is 8th element, which is 82.
Hence the median of the data is 82.
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A batch of bread requires 3 cups of flour. How many batches can you make with 2 cups of flour?
Answers
Answer:
Step-by-step explanation:
To find out how many batches of bread you can make with 2 cups of flour, you need to divide the amount of flour you have by the amount of flour each batch requires.We know that a batch of bread requires 3 cups of flour. To find out how many batches you can make with 2 cups of flour, you can divide 2 by 3:2 / 3 = 0.67Therefore, you can make 0.67 batches of bread with 2 cups of flour. However, since you can't bake a fraction of a batch, you can't make any batches of bread with 2 cups of flour, as it is not enough. You will need at least 3 cups of flour to make a batch of bread.
To rent a certain meeting room, a college charges a reservation fee of $35 and an additional fee of $5.80 per hour. he history club wants to spend less than $69.80on renting the meeting room. What are the possible amounts of time for which they could rent the meeting room?
Answers
The possible amounts of time for which they could rent the meeting room is 1.71 hours
How to determine the hours?The question states that
The college charges a reservation fee of $35 and an additional fee of $5.80 per hour.The history club wants to spend less than $69.80on renting the meeting roomThis implies that
35x + 5.80x ≤69.80
Solving the inequality to have
40.8x ≤69.80
Making x the subject of the relation we have
x≤1.71
In conclusion it takes the college 1.71 of time for them to rent the meeting room
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speedy boat rental charge 15$ deposit fee plus 2$ for each hour of use to rent a paddle boat Write an equation to find how many hours,h,
Answers
The number of hours that the rented the boat, if the total cost was $33 would be represented by the equation: 33 = 2h + 15
How to write the equation ?To write the equation on the number of hours that the boat would have been rented for to get a total cost of $ 33, use the formula :
Total cost = Deposit fee + ( Cost per hour x Number of hours boat was used)
Total cost = $ 33
Cost per hour = $ 2
Number of hours boat was in use = h
The equation therefore is:
33 = 2 h + 15
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The full question is:
Speedy Boat Rental charges a $15 deposit fee plus $2 for each hour of use to rent a paddleboat. Write an equation to find out for how many hours, h, they rented the Boat if the total cost was $33.
PLEASE HURRY,TEST QUESTION,LIMITED TIME!
Question- Write the standard form equation of the circle given the center of (-1,0) and the circumference of 8π. Show all work using the equation editor to calculate the missing pieces of the equation.
Answers
Answer: (x+1)^2 + (y-0)^2 = 8pi^2
Step-by-step explanation:
a study that surveyed a random sample of otherwise healthy high school students found that they are more likely to get muscle cramps when they are stressed. the study also noted that students drink more coffee and sleep less when they are stressed. (a) what type of study is this? observational experiment correct: your answer is correct. (b) can this study be used to conclude a causal relationship between increased stress and muscle cramps? yes no correct: your answer is correct. (c) state possible confounding variables that might explain the observed relationship between increased stress and muscle cramps. (select all that apply.) extra-curricular activities caffeine lack of sleep classes
Answers
This is because a survey of healthy high school students who were chosen at random revealed that stress is more likely to produce muscle cramps.
(a) What kind of research is this?
"Observational study" is the study's type.
Reason: This is because a survey of healthy high school students who were chosen at random revealed that stress is more likely to produce muscle cramps.
Can this data be used to draw a causal conclusion about the link between elevated stress levels and muscle cramps?
No, an observational study was unable to draw any conclusions about the link between elevated stress levels and muscle cramps. The Chi-square test can be used to determine the relationship between increasing stress and cramps.
(c) Describe any potential confounding factors that could account for the correlation between greater stress and muscle cramps.
Muscle cramps may be impacted by the increased stress.
In this case, the factors under consideration are qualitative variables. Count the number of times that high school students have visited a doctor with a muscular ailment.
Confounding factors for stress may include anxiety over taking the exam, less sleep, spending more time studying, eating less, drinking more coffee, and other factors.
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The highschool student council has decided to have a dance-a-thon and needs to hire a disk jockey for the event. Council members have investigated 3 companies. Gabe's Mobile Music charges $60 per hour. Derek's DJ Service charges $100 plus $40 per hour. Solid Sounds charges $175 plus $30 per hour. Which company should they choose? Why?
Answers
Answer:
Solid Sounds
Step-by-step explanation:
As a test, let's say the dance-a-thon lasted 10 hours. Plug in 10 hours to each:
Gabe's: $60/hr x 10 hr = $600
Derek's: $100 + ($40/hr x 10 hr) = $500
Solid Sounds: $175 + ($30/hr x 10 hr) = $475
This shows that Solid Sounds is the cheapest (no matter how many hours the dance lasts)
A chemical company make two brand of antifreeze. The firt brand i 60% pure antifreeze, and the econd brand i 85% pure antifreeze. In order to obtain 80 gallon of a mixture that contain 70% pure antifreeze, how many gallon of each brand of antifreeze mut be ued?
Answers
To obtain 80 number of gallons of a mixture that contains 70% pure antifreeze, you must use 56 gallons of the 60% pure antifreeze and 24 gallons of the 85% pure antifreeze.
1. Calculate the total amount of antifreeze needed to make 80 gallons of the 70% mixture.
80 gallons x 0.7 = 56 gallons of antifreeze
2. Calculate the amount of 60% pure antifreeze needed.
56 gallons x 0.6 = 33.6 gallons of 60% pure antifreeze
3. Calculate the amount of 85% pure antifreeze needed.
56 gallons x 0.85 = 47.6 gallons of 85% pure antifreeze
4. Subtract the amount of 60% antifreeze from the total amount of antifreeze needed to determine the amount of 85% antifreeze needed.
56 gallons - 33.6 gallons = 22.4 gallons of 85% pure antifreeze
5. Round the amounts to the nearest whole number.
33.6 gallons of 60% pure antifreeze and 24 number of gallons of 85% pure antifreeze.
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write an equivalent expression by distributing the “-“ sign outside the parenthesis: -(-0.1p+4)
Answers
The equivalent of the expression -(-0.1p+4) is 0.1p-4
What is equivalent of expression?Equivalent expressions are expressions that work the same even though they look different. If two algebraic expressions are equivalent, then the two expressions have the same value.
For example: 3(x + 2) and 3x + 6 are equivalent expressions because the value of both the expressions remains the same for any value of x. 3x + 6 = 3 × 4 + 6 = 18. and can also be written as 6(x² + 2y + 1) = 6x² + 12y + 6.
Similarly -( - 0.1p + 4) can be written in another for by multiplying the negative sign with every term in the parentheses.
therefore -1× -0.1p + -1×4 = 0.1p -4
This means -(-0.1p+4) and 0.1p -4 are equivalent
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two unit squares share the same center. the overlapping region of the two squares is an octagon with perimeter $3.5$. what is the area of the octagon?
Answers
The area of the octagon is 0.875 units square.
Two unit squares share the same center. The overlapping region of the two squares is an octagon with perimeter 3.5.
Area of a triangle:
We need to know how to calculate the area of a triangle, in order to solve this question. The area of a triangle with base b and height h is [tex]\frac{hb}{2}[/tex]. An octagon is a 2D figure with 8 sides.
Let A, B, C, D, E, F, G, and H be eight consecutive vertices of the octagon. Let 0 be the common center of the square units.
Draw the segments OA, OB, OC, OD, OE, OF, OG and OH, connecting the vertices with the common center O of the squares.
The segments divide the octagon into 8 concurrent triangles.
Perimeter of the hexagon=(AB+BC+CD+DE+EF+FG+GH+HA)In these triangles, AB, BC, CD, DE,EF, FG, GH, and HA are the bases; the height is 12 of a unit in all the triangles.
Thus, the area of the octagon=[tex]\frac{1}{2}[/tex]×[tex]\frac{1}{2}[/tex]×(AB+BC+CD+DE+EF+FG+GH+HA)
=[tex]\frac{1}{4}[/tex]×(Perimeter of the hexagon)=14×3.5=3.54=0.875
Therefore, the area of the octagon is 0.875 units square.
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Solve the system of equations.
Answers
Answer: y,x = -2,3 is your answer. I hope this helps!
Step-by-step explanation:
What is the distance between PQ? Explain. Best explanation gets brainliest
Answers
The length of the line segment is given by the distance equation
D = 7.2 units
What is the distance of a line between 2 points?The distance of a line between 2 points is always positive and given by the formula
Let the first point be A ( x₁ , y₁ ) and the second point be B ( x₂ , y₂ )
The distance between A and B is D , and the distance D is
Distance D = √ ( x₂ - x₁ )² + ( y₂ - y₁ )²
Given data ,
Let the distance of the line segment between two points be D
Now , the equation will be
Let the first point be represented as P ( 1 , 6 )
Let the second point be represented as Q ( 7 , 2 )
Now , distance between P and Q is D , and the distance D is
Distance D = √ ( x₂ - x₁ )² + ( y₂ - y₁ )²
D = √ ( 1 - 7 )² + ( 6 - 2 )²
On simplifying the equation , we get
D = √ ( -6 )² + ( 4 )²
D = √ ( 36 + 16 )
D = √ 52
D = 7.2 units
Hence , the distance is 7.2 units
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Answer the following questions:
1. For a triangle oriented similar to the triangle in Example 3, find the value of h if a = 6 and b = 24.
2. Leo is inspecting a 1 cm ∶ 1.5 m scale floor plan of his new house. The dimensions of his bedroom in the scaled plan are 2 cm by 3 cm. What is the area of Leo’s actual bedroom in square meters?
3. You jogged 2.4 miles in 30 minutes. At that rate, how long will it take you to jog 3.2 miles?
4. An airplane flies 100 miles in half an hour. How far can it fly in 1 1⁄4 hours at the same speed?
5. The currency in Tajikistan is the Somoni. The exchange rate is approximately 0.17 Somoni = 1 Philippine peso. How much money in Somoni would you get with ₱500?
6. A map scale designates 1 inch = 25 km. The distance between the two towns on the map is 3 inches. If a liter of gasoline can last you for 50 kilometers, how many liters of gasoline would you need to drive from the first town to the second?
Answers
Answer: Using the formula for similar triangles, you can find the value of h by multiplying b by the ratio of corresponding sides. If a = 6 and b = 24, then the ratio of corresponding sides is 6/24 = 1/4. Therefore, h = b * (1/4) = 24 * (1/4) = 6
To find the area of Leo's actual bedroom in square meters, you can use the scale factor of 1 cm : 1.5 m and multiply the dimensions of the scaled plan by this factor. If the dimensions of the scaled plan are 2 cm by 3 cm, then the actual dimensions of the bedroom are 2 cm x 1.5 m/cm x 3 cm x 1.5 m/cm = 3 m x 4.5 m = 13.5 square meters
To find how long it will take to jog 3.2 miles at the same rate, you can use the formula distance = rate x time. If you jogged 2.4 miles in 30 minutes, then you can find the rate by dividing distance by time, which is 2.4 miles / 30 minutes = 0.08 miles/minute. Therefore, time = distance / rate = 3.2 miles / 0.08 miles/minute = 40 minutes
To find how far an airplane can fly in 1 1/4 hours, you can use the formula distance = rate x time. If the airplane flies 100 miles in half an hour, then the rate is 100 miles / 0.5 hours = 200 miles/hour. Therefore, distance = rate x time = 200 miles/hour x 1.25 hours = 250 miles
To find how much money in Somoni you would get with ₱500, you can use the exchange rate of 0.17 Somoni = 1 Philippine peso. Therefore, 0.17 Somoni x ₱500 = ₱85 Somoni
To find how many liters of gasoline you would need to drive from the first town to the second, you can use the map scale and
Step-by-step explanation:
DE is a midsegment of the triangle
If BC=6x-2 and DE=2x+2 find the length of BC
Answers
If BC=6x-2 and DE=2x+2, then the length of BC is 16.
DE is a midsegment of the triangle.
As we know that;
A midsegment is a line segment that joins two of the midpoints of a triangle's sides.
The midsegment linking the midpoints of two sides of a triangle is parallel to the third side of the triangle, and its length is half that of the third side, according to the midsegment theorem.
So according to Midpoint Theorem
DE = BC/2
Now putting the value
2x+2 = (6x-2)/2
Multiply by 2 on both side, we get
4x + 4 = 6x-2
Add 2 on both side, we get
6x = 4x + 6
Subtract 4x on both side, we get
2x = 6
Divide by 2 on both side, we get
x = 3
Now putting the value of x in BC=6x-2
BC = 6(3) - 2
BC = 18 - 2
BC = 16
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Maria orders 8 pizzas for 24 people coming to her party.
a) How many people can be fed
b) How many pizzas would she need if 33 people come to the party.
Answers
Using the arithmetic operation of division -
a) 3 people can be fed by 1 pizza.
b) Maria would need 11 pizzas for 33 people.
What is arithmetic operation?
A subject of mathematics known as arithmetic operations deals with the study and use of numbers in all other branches of mathematics. Basic operations including addition, subtraction, multiplication, and division are included.
The number of pizzas ordered = 8
The number of people are = 24.
Number of people that can be fed if 1 pizza was there =
Number of people = Number of people that came/ Number of pizza
Use the arithmetic operation of division -
Number of people = 24/8
Number of people = 3
Therefore, 3 people can be fed.
Now, the number of people = 33
Number of pizzas required for 33 people can be obtained as -
Use the arithmetic operation of division -
Number of pizzas = Number of people/ Number of people fed by 1 pizza
Number of pizzas = 33/3
Number of pizzas = 11
Therefore, Maria will require 11 pizzas.
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The function y = f (x) is graphed below. What is the average rate of change of the function f(x) on the interval - 1 ≤ x ≤ 3?
Answers
For the function y = f (x), the average rate of change on the interval - 1 ≤ x ≤ 3 is -2.
What is a function?
In mathematics, a function is a unique arrangement of the inputs (also referred to as the domain) and their outputs (sometimes referred to as the codomain), where each input has exactly one output and the output can be linked to its input.
The graph of the function f(x) is graphed and the graph is given.
The average rate of change is a measure of how much the function changed per unit, on average, over that interval.
For a function f(x) at interval [a,b], the average rate of change is given as -
[f(b) - f(a)]/(b - a)
The interval values is given as - [-1,3]
The value for f(a) as seen in the graph is - 4.
The value for f(b) as seen in the graph is - -4.
Substitute the values in the equation -
Average rate of change = [f(b) - f(a)]/(b - a)
A = (-4 - 4)/[3 - (-1)]
A = -8/(3 + 1)
A = -8/4
A = -2
Therefore, the value for average rate of change is -2.
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Part B
Here’s a different way to partition the same function. Write a description of the partitioned function using known function types. Include function transformations in your description
Answers
With a negative leading coefficient, quadratic polynomials, and the horizontal offset for a scaled 1/x function.
Section 1's wiggles might be attributed to a variety of distinct purposes. A fourth-degree polynomial is maybe the simplest. It would have to have a negative leading coefficient in order to have downward-trending end behavior.
The curve in section 2 appears to represent either an exponential function or a scaled and translated version of 1/x. We prefer a version of 1/x because the latter is anticipated to approach the horizontal asymptote more quickly than is depicted above.
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a rectangle is 9 cm longer than it is wide. the width is one seventh of the perimeter. find the length and the width.
Answers
If the rectangle is 9 cm longer than it's width , and the width is 1/7th of perimeter , then the length of rectangle is 15 cm and width of rectangle is 6 cm.
let the rectangle's length be = l cm ;
and let the width of rectangle is = w cm ;
the length is 9 cm longer than its width , that means ;
⇒ l = w + 9 ...equation(1)
and the width is 1/7 of perimeter , then
⇒ w = (1/7)(2l + 2w)
⇒ w = 2/7(l + w) .....equation(2) ;
substituting value of equation(1) in equation(2) ;
we get ;
⇒ w = (2/7) × ( w + 9 + w ) ;
on simplifying ,
we get ;
⇒ w = 6 .
from equation(1) ⇒ l = 6 + 9 = 15 .
Therefore , the length is 15 cm and width is 6 cm .
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gasoline is sold by the liter in many countries. how many liters are required to fill a 12.0-gal gas tank?
Answers
The Volume or liters required to fill a 12.0 - gal gas tank is 45.42 liters.
Gallon to liter conversion factors are:
[tex]1 \ Gallon = 3.785 \ Liter[/tex]
Assuming that the gallon measurement for the gas tank is 12.0 gal.
We now need to calculate the gas tank's liter capacity.
As, 1 gallon = 3.785 liter
[tex]So \ 12\ gallon = 12*3.785[/tex]
[tex]=45.42\ gallons.[/tex]
Therefore, 45.42 liters of liquid are needed to fill the gas tank.
Meaning of gasoline:
Petroleum is the source of gasoline, which is a mixture of flammable, volatile liquid hydrocarbons used as a fuel for internal combustion engines and as a solvent for oils and fats.
It is a by-product of the petroleum industry and is used as fuel for cars because it burns with a high degree of energy and mixes easily with air in a carburetor.
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The graphs of lines k1 and k2 are shown on the grid. Which system of equations is best represented by this graph?
F. 3x-y=2
4x+9y=36
G. 3x-y=6
4x+9y=4
H. x-3y=-18
9x+4y=9
J. x+y=10
9x+4y=13
Answers
The equations which represents the given graph is 3x-y=2 and
4x+9y=36 .
What is Linear equation ?
Linear equation can be defined as the equation in which the highest degree is one
Given ,
The graphs of lines k1 and k2 are shown on the grid.
From the given graph ,
The Two lines are intersecting at a point x = 49/31 and y=85/31
So, lets put the values of and y in the given linear equations
so we get,
3x-y=2
4x+9y=36
put values x = 49/31 and y=85/31
so ,
3*(49/31) - 85/31 = 2
= 62/31
= RHS
which is equals to RHS
4*(49/31)+9*(85/31) = 36
=36* 31 / 31
= RHS
Which equals to RHS
Hence, The equations which represents the given graph is 3x-y=2
4x+9y=36 .
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Brittany opened a checking account with $50 she received for her birthday. She deposits $5 of her allowance each week.
Answers
Maggie wants to purchase songs from a streaming service. Each song has a cost of x dollars. Which situation can be represented by this inequality?
8 + 4x < 12 + 3x
Answers
The inequality says that the cost of each song is less than 4 dollars.
Which situation can be represented by this inequality?We want to see which situation can be represented by the inequality below.
8 + 4x < 12 + 3x
Where we know that each song costs x dollars.
The situation represented by that inequality can be:
"8 dollars plus 4 songs has less value than 12 dollars plus 3 songs"
We can also simplify the inequality to get:
8 + 4x < 12 + 3x
4x -3x < 12 - 4
x < 4
We also can see that the cost of each song is less than $4.
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If someone can help mee it would be great
Answers
Answer: Yes it's 15
Step-by-step explanation:
20/100 x 75 = 15
Use the unit circle to find the value of sec (0°).
a. Sec (0°) =undefined
b. Sec(0°) = 1
C. Sec (0°) = 0
d. Sec (0°) = 2
Please select the best answer from the choices provided
Answers
By using the unit circle , we found that the value of Sec(0°) is (b) Sec(0°) = 1 .
The Unit Circle is defined as a circle that have a radius of 1 which is centered at the origin of a coordinate plane.
The angle in the unit circle are measured in radians.
The Secant function, denoted by Sec(x), is defined as 1/Cos(x) ;
we have to find the value of Sec(0°) ;
So , at 0 degrees, the point (1,0) lies on the unit circle and
the x-coordinate of this point is 1 which is the cos(0) and
the value of Sec(0) = 1/cos(0) = 1/1 = 1
Therefore , the value of Sec(0°) is = 1 .
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3.3.8 in a precourse, anonymous survey of students in her introductory statistics course, one of the authors asked her students how many hours per week they expected to spend studying statistics outside of class. forty-nine students responded to that question, with an average of 8.2 hours and a sd of 3.79 hours. the data were not strongly skewed. a) identify the observational unit for this study. b) identify the variable of interest and whether it is categorical or quantitative. c) use the theory-based inference applet to calculate and report the 95% confidence interval for the parameter of interest. d) in the context of this study, was it valid to use the theory-based (t-distribution) approach to find a confidence interval? explain your reasoning. e) interpret the 95% confidence interval reported in part (c) in the context of the study.
Answers
Above 95% confidence interval for population mean =(6.7149 to 9.2051)
Given that,
3.3.8 One of the writers asked her students how many hours a week they anticipated studying statistics outside of class in a pre-course, anonymous survey for her introductory statistics course. The average response time was 8.2 hours, with a standard deviation of 3.79 hours, from 49 students. Data were not significantly skewed.
To find : a) specify the study's observational unit. b) Determine if the variable is categorical or quantitative and the variable of interest. c) compute and present the 95% confidence interval for the parameter of interest using the theory-based inference applet. d) Was it appropriate to determine a confidence interval using the theory-based (t-distribution) technique in the setting of this study?
sample mean x= 7.960
sample size n= 36.00
sample std deviation s= 3.68
std error sx=s/√n= 0.6133
for 95% CI; and 35 df, value of t= 2.030
margin of error E=t*std error = 1.245
lower bound=sample mean-E = 6.7149
Upper bound=sample mean+E = 9.2051
from above 95% confidence interval for population mean =(6.7149 to 9.2051)
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