The 20 questions test answers may a student mark 8192 ways.
What is the combinations?
A combination in mathematics is a choice made from a group of separate elements where the order of the selection is irrelevant.
Since there are 20 questions, and each question can be answered in if 7 questions mark correctly and 13 incorrectly then:
7 questions can be answered correctly.
13 questions can be answered incorrectly.
The 2 questions can be answered in
2 × 2 ways.
The 3 questions can be answered in 2×2×2 ways and so on.
So we have:
1 × 1 × 1 × 1 × 1 × 1 × 1 × 2¹³
= 8192
Hence, the 20 questions test answers may a student mark 8192 ways.
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4. ¿Por qué al colocar un vaso lleno sobre un papel y tirar con fuerza de éste, el vaso no se mueve?
Answer: The glass of water has inertia
Step-by-step explanation: The trick works no matter how heavy an object is since friction is weaker for lighter objects. Provided you pull quickly enough, this trick can even be done with glasses or plate
Find the indicated side.
Hence, the indicated side hypotenuse is [tex]46[/tex].
What is the angle?
Angles are an integral facet in the study of mathematics, particularly geometry. Angles are formed by two rays (or lines) that begin at the same point or share the same endpoint. The point at which the two rays meet (intersect) is called the vertex.
Let us assume the angle name [tex]x[/tex] and the triangle [tex]ABC[/tex], and the hypotenuse is [tex]y[/tex].
Here given angle and side are
[tex]x=30[/tex] degree
And the side [tex]AB=23[/tex]
Now we are applying the [tex]sine[/tex] because it is
[tex]sinx=\frac{P}{H}[/tex]
So,
[tex]sin(30)=\frac{23}{y}\\\\\frac{1}{2}=\frac{23}{y}\\\\y=46[/tex]
Hence, the indicated side hypotenuse is [tex]46[/tex].
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3. AABC AEFG, mZA = 25°, and m/F = 100°.
What is m/C?
A. 125°
B. 100°
C. 55°
D. 25°
Answer: A
Step-by-step explanation: To solve this problem, we need to use the properties of triangles and the given information to determine the measure of angle C.
First, we can use the fact that angle A is opposite angle C to deduce that angles A and C are congruent (i.e. they have the same measure). This means that the measure of angle C is 25 degrees.
Next, we can use the fact that triangle AABC is isosceles (i.e. it has two sides of equal length) to deduce that angle B is also 25 degrees. This is because the sum of the interior angles of a triangle is 180 degrees, so if angle A is 25 degrees and angle C is 25 degrees, then the remaining angle, angle B, must be 180 - (25 + 25) = 130 degrees.
We can also use the fact that triangle AEFG is isosceles to deduce that angle F is also 100 degrees. This is because the sum of the interior angles of a triangle is 180 degrees, so if angle E is 100 degrees, then the remaining angle, angle F, must be 180 - 100 = 80 degrees.
Finally, we can use the given information that the measure of angle Z is 25 degrees and the measure of angle F is 100 degrees to deduce that the measure of angle X is 180 - (25 + 100) = 55 degrees. This is because the sum of the interior angles of a triangle is 180 degrees, and we have already determined the measures of two of the angles (angles Z and F).
Therefore, the measure of angle C is 25 degrees, which means the correct answer is A) 125 degrees.
(1 point) some shrubs have the useful ability to resprout from their roots after their tops are destroyed. fire is a particular threat to shrubs in dry climates, as it can injure the roots as well as destroy the aboveground material. one study of resprouting took place in a dry area of mexico. the investigation clipped the tops of samples of several species of shrubs. in some cases, they also applied a propane torch to the stumps to simulate a fire. of 14 specimens of a particular species, 6 resprouted after fire. estimate with 95% confidence the proportion of all shrubs of this species that will resprout after fire.
With a 95% confidence interval, the proportion of all shrubs of this species that will resprout after a fire is between 0.17 and 0.67.
What is a confidence interval?
An area surrounding a measurement that indicates how accurate it is called a confidence interval.
Here, we have
Confidence interval is written as
Sample proportion ± margin of error
Margin of error = z × √pq/n
Where
z represents the z score corresponding to the confidence level
p = sample proportion. It also means the probability of success
q = probability of failure
q = 1 - p
p = x/n
Where
n represents the number of samples
x represents the number of success
From the information given,
n = 14
x = 6
p = 6/14 = 0.42
q = 1 - 0.42 = 0.58
To determine the z score, we subtract the confidence level from 100% to get α
α = 1 - 0.95 = 0.05
α/2 = 0.05/2 = 0.025
This is the area in each tail.
Since we want the area in the middle, it becomes
1 - 0.025 = 0.975
The z score corresponding to the area on the z table is 2.05. Thus, Thus, the z score for a confidence level of 95% is 1.96
Therefore, the 95% confidence interval is
0.42 ± 1.96√(0.58)(0.42)/14
The lower limit of the confidence interval is
0.42 - 0.25 = 0.17
The upper limit of the confidence interval is
0.42 + 0.25 = 0.67
Hence, with a 95% confidence interval, the proportion of all shrubs of this species that will resprout after a fire is between 0.17 and 0.67.
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-Snow skis were first used in northern Europe and Asia thousands of
from the bones of large animals
years ago. They were probably (18)
and strapped with strips of leather to the boots of skiers. These primitive
skis were used primarily on flat ground as a means of traveling from one
(19) for rapid
place to another. The loose bindings made them too
downhill movement. Not until the development of better skis, more secure
(20) as a
19
fastening methods, and ski lifts did skiing attain
recreational and competitive sport.
18 F diverted
G dissected
H fashioned
J manufactured
A annoying
B laborious
C precarious
D inaccurate
20 F projection
G productivity
H perspective
J prominence
Answer:
no
Step-by-step explanation:
Given 29 213.
Which lines, if any, must be parallel based on the given
information? Justify your conclusion.
c|d, Converse of the Same-Side Interior Angles
Theorem
a | b, Converse of the Alternate Interior Angles
Theorem
c|| d. Converse of the Corresponding Angles
Theorem
not enough information to make a conclusion
Answer:
has to be c other wise it would make sense
Assume that male and female births are equally likely and that the birth of any child does not affect the probability of the gender of any other children. Find the probability of exactly eight boys in ten births.
There is a 0.044% probability of having exactly 8 boys in a sample of 10 births.
What is probability?
Simply put, the probability is the likelihood that something will occur.
When we don't know how an event will turn out, we can discuss the likelihood or likelihood of several outcomes.
Statistics is the study of events that follow a probability distribution.
For instance, there is only one way to receive a head and there are a total of two possible outcomes, hence the probability of flipping a coin and getting heads is 1 in 2 (a head or tail).
P(heads) = 1/2 is what we write.
So, X is the proportion of boys among n particular births. Let p represent the likelihood of having a boy at a certain birth.
Here n=10.
Additionally, because male and female births are equally likely, there is a 50% chance of having a boy or a girl.
P(Boy) = P(girl) = 0.5
p = 0.5
Based on the information provided, there will be a defined number of trials (n) of 10, with a constant chance of success (p).
Furthermore, every trial stands alone from the others.
So, with n=10 and p=0.5, X follows a binomial distribution.
The following is the probability function of the binomial distribution for the k number of successes, where x = k.
[tex]\mathrm{P}(\mathrm{X}=\mathrm{k})=(10 C k) 0.5^k(1-0.5)^{10-k}[/tex]
Finding the likelihood of 8 boys in n=10 births is necessary.
P(X=8) = (10C8)0.5⁸(1-0.5)¹⁰⁻⁸
= 45 × 0.0039 × 0.25
P(X = 8) = 0.0438
Therefore, there is a 0.044% probability of having exactly 8 boys in a sample of 10 births.
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in the stock market, changes in value used to be indicated by fractions, which represented portions of $1. if a stock had a value of $11.50, write and evaluate an addition expression to find how much the stock is worth after an increase of 1/4
The worth of the stock after the increase is $14.375.
What is an expression?Expression simply refers to the mathematical statements which have at least two terms which are related by an operator and contain either numbers, variables, or both. Addition, subtraction, multiplication, and division are all possible mathematical operations.
Based on the information given, the addition expression will be:
= Original value + Increase
= $11.50 + (1/4 × $11.50)
= $11.50 + $2.875
= $14.375
The value is $14.375.
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v.2 find the slope from two points
Answer:y2-y1/x2-x1
Step-by-step explanation:
The formula for rise over run or slope is y2-y1 divided by x2-x1
An example
(5,4),(3,7)
y2=7,y1=4
x2=3,x1=5
plug in and solve
7-4/3-5
slope would be -1
Hi pls help me
Answer also the 3 questions
Step-by-step explanation:
the table was filled correctly already by somebody yesterday.
the important thing to remember is that an arc angle is always measured at the center point of the circle. that is the difference to angles between the intersecting lines of arc segments.
it would be really important that you start doing these things yourself. this hands-on experience of these (really basic) questions is designed to help you get a feeling how these things work together, which makes later topics much easier for you.
please tell me what you don't understand here. you only need to apply common sense. no magic voodoo math formulas or strategies.
FAR = 100° FR = 140° VO = 60° FR+VO = 200°
FAV = 80° FV = 60° RO = 100° FV+RO = 160°
OAV = 100° VO = 60° FR = 140° VO+FR = 200°
OAR = 80° RO = 100° FV = 60° RO+FV = 160°
how did we get the measures of the intercepted arcs ? by counting the 20° segments on the arc. the full circle arc represents 360°. always, for every circle. one time around is one time around and therefore 360°, no matter the size of the circle.
when you stand directly on the south pole of the Earth for 24 hours, you will have rotated the full 360° in that time (one rotation per day). if you stand on the equator for 24 hours, the Earth has taken you on one spin of the full 360°. the difference is the absolute arc length and the necessary speed at which we cover the distance of a full arc length.
every 250 million years our whole sogar system rotates once (by the full 360°) around the center of our galaxy.
the degrees have nothing to do with radius, diameter, area, ... of a circle. only with the relative parts of the circumference. when the minute arm of a clock moved for 15 minutes, then it went 90° around the clock's face. after 60 minutes it went the full 360°, and the cycle starts anew.
so, minutes on a clock or hours of the day are just another way of counting degrees around a circle.
what have we noticed with the sum of the measures of the intercepted arcs ?
many things.
e.g.
they are exactly twice as large as the line angles. 100 to 200. 80 to 160.
the sum of 2 pairs of opposing arc angles is always 360°.
...
so, how will we get the line angles based on the sum of the angles of the intersected arcs ?
we cut the sum of the intersected arc angles in half. 200 to 100. 160 to 80.
Find the values of the variables in each parallelogram
Adjacent angles of a parallelogram are supplementary.
[tex]y+3y=180 \\ \\ 4y=180 \\ \\ y=\boxed{45} \\ \\ \\ \\ 3(45)+3x=180 \\ \\ 45+x=60 \\ \\ x=\boxed{15}[/tex]
r+r+r+r+r in algebraic simplified
Answer:
5r
Step-by-step explanation:
r+r+r+r+r=5r
What is the value of the expression below when z = 3?
z²+z+7
Answer:
19
Step-by-step explanation:
3^2+3+7
9+3+7
12+7
19
Hopes this helps please mark brainliest
place the flags 1 standard deviation on either side of the mean. what is the area between these two values? what does the empirical rule say this area is?
The area between one standard deviation and either side of mean is 34%
The empirical rule, also referred to as the three-sigma rule or 68-95-99.7 rule, is a statistical rule which states that for a normal distribution, almost all observed data will fall within three standard deviations (denoted by σ) of the mean or average (denoted by µ).
In particular, the empirical rule predicts that 68% of observations falls within the first standard deviation (µ ± σ)
95% within the first two standard deviations (µ ± 2σ)
99.7% within the first three standard deviations (µ ± 3σ).
According to the question,
If we place the flag 1 standard deviation on either side of the mean
which means flag is placed either on (µ + σ) or ( (µ - σ)
and Using Empirical rule,
68% of area lie under (µ ± σ)
Therefore , Area between either (µ + σ) or ( (µ - σ) = 68 / 2
=> 34%
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x^2 + 4x + y^2 - 4y - 28= 0
I don't know for certain if you are trying to write this in standard form, graph it, or so forth. However, here is the standard form.
Standard Form:
[tex](x+2)^2+(y-2)^2=36\\[/tex]
Hope this helps you!
using a random sample from a population, carys cannot decide if she wants to construct a 90 percent confidence interval for the population mean or a 95 percent confidence interval for the population mean. what is the difference between the two confidence intervals?
if a statistician decides to construct using 90 percent C I over a 95% C I, it tells you that you have 10% chance of being wrong rather than 5% chance of being wrong while using the 95%.
What is the percentage?
It's the ratio of two integers stated as a fraction of a hundred parts. It is a metric for comparing two sets of data, and it is expressed as a percentage using the percent symbol.
A confidence interval is a range that shows how precise the measurement is.
if a statistician decides to construct using 90 percent C I over a 95% C I, it tells you that you have 10% chance of being wrong rather than 5% chance of being wrong while using the 95%.
Also a 90 percent confidence interval would be narrower than a 95 percent confidence interval
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convert 436 mm to cm. answer as a whole number or decimal number with the correct number of significant figures.
Circle the numbers that are divisible by both 2 and 3 (20,36,42,45,50,78)
Answer: 36, 42, 78
Step-by-step explanation:
20 is only divisible by 2
50 is only divisible by 2
45 is only divisible by 3
36/2=18 36/3=12
42/2=21 42/3=14
78/2=39 78/3=26
Answer: 36, 42, 78
Step-by-step explanation:
36/2= 15, 36/3=12
42/2= 21, 42/3=14
78/2=39, 78/3=39
A truck has a mass of 5000 kg. The truck driver presses on the brakes. The unbalanced net force acting on the truck when the brakes were applied was 6000N. What is the truck’s Acceleration?
The acceleration of the truck when it has a mass of 5000 kg and the truck driver presses on the brakes is 1.2m/s².
What is acceleration?The rate of change of an object's velocity with respect to time is defined as acceleration. Vector quantities are accelerations.
The orientation of an object's acceleration is determined by the orientation of the net force acting on that object's acceleration, which is the rate at which velocity changes over time in terms of both speed and direction. A point or object moving in a straight line is accelerated if it accelerates or decelerates.
Acceleration will be:
= Force / mass
= 6000 / 5000
= 1.2 m/s²
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2 + 10 ^2 ( 9 + 10 )
Answer:
The answer is 1902
Step-by-step explanation: You use pemdas. First you ansewer whats in the parentheses then exponents then add
Answer:
1902
Step-by-step explanation:
10^2= 100
9+10= 19
2+100(19) 19*100=1900 and then add 2 to get 1902
find the most general antiderivative of the function. (check your answer by differentiation. use c for the constant of the antiderivative. remember to use absolute values where appropriate.) f(x)
Answer:
Step-by-step explanation:
Sugar Bombs cereal is including a Sherlock Holmes action-figure in each box during a
promotion. Claire plans to purchase boxes until she has all five action-figures. How many boxes
should she expect to buy if each figure is equally likely to be in any box??
a. Describe how you will use a random number table to conduct this simulation.
b. Show five trials by clearly labeling the random number table given below. Specify the outcome of each trial.
73184 95907 05179 51002 83374 52297 07769 99792 78365 93487
72753 36216 07230 35793 71907 65571 66784 25548 91861 15725
c. State your conclusion.
Part a: Ignoring those that are bigger than 4.
Part b: labeling the random number.
Part c: conclusion, Claire should plan to purchase 12 boxes.
Describe the term random number table?A table of digits is a random number table. The numbers 1, 2, 3,4,5,6,7,8,9,0 were used as the starting point for the random procedure that selected the digit for each location in the table. Each digit had an equal chance of being selected.Part a: random number table;
Let each of five trials figures be represented by a number from 0 to 4.Pick digits at random from a table of numbers, ignoring those that are bigger than 4. Determine how many digits (0–4) from the table—including repeats—are required to get all five numbers. One try, like this.Part b: labeling the random number.
7318495907 05179 51002(10 boxes) 8337452297 07769 99792 78365 9348772753 36216 (15 boxes) 07230 35793 71907 65571 66784(10 boxes) 25548 91861 15725.
Part c: conclusion,
On average, Claire should plan to purchase 12 boxes.
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solve please i'm desperate
Answer:
-4/5 (fraction)
Step-by-step explanation:
add the numbers:
25x^2-16=0
use quadratic formula
simplify -40/50
-4/5
Simplify the following by applying the laws of exponents.
Expression [tex]\frac{x^7y^5}{x^2y^3}[/tex] can be simplified as x⁵y² by applying laws of components.
What is an algebraic expression?An algebraic expression is consists of variables, numbers with various mathematical operations,
The given expression is,
[tex]\frac{x^7y^5}{x^2y^3}[/tex]
Simplify the expression by using law of exponents [tex]a^n/a^m =a^{(n-m)[/tex],
The expression can be rewritten as,
= [tex]x^{(7-2)}{y^{(5-3)}[/tex]
= x⁵ y²
The expression can be simplified as x⁵y².
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a single die is rolled twice. find the probability of getting a 3 the first time and a 3 the second time.
The probability of rolling a 3 the first time and a 3 the second time is 1/36.
Given that,
There are two rolls of one die.
We have to determine the probability of receiving a 3 both the first and second times.
We know that,
There are 6 faces on a die.
Of these 6 faces, one of them is 3 and one of them is 3
So, the probabilities of rolling a 3 and a 3 are:
P(3) = 1/6
P(3) = 1/6
The probability of rolling a 3 the first time and a 3 the second time is calculated as follows:
Pr=P(3)×P(3)
This gives
Pr=1/6×1/6
Multiply
Pr=1/36
Therefore, the probability of rolling a 3 the first time and a 3 the second time is 1/36.
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when the null hypothesis is rejected, it is possible a type ii error has occurred. not possible a type i error has occurred. possible a type i error has occurred. possible either a type i or a type ii error has occurred.
When the null hypothesis is rejected possible a Type i error has occurred.
Let's Understand what is null hypothesis?
A statistical hypothesis known as a null hypothesis asserts that no statistical significance can be found in a set of provided observations. Using sample data, hypothesis testing is used to judge a hypothesis' veracity. It is sometimes referred to as just "the null" and its symbol is [tex]H_{0}[/tex].
We have total 4 cases:
[tex]H_{0}[/tex] accepted when [tex]H_{0}[/tex] is true -> Correct decision
[tex]H_{0}[/tex] rejected when [tex]H_{0}[/tex] is true -> Type i Error when null hypothesis is present and we have rejected
[tex]H_{0}[/tex] accepted when [tex]H_{0}[/tex] is false -> Type ii Error when null hypothesis is not present but we have accepted
[tex]H_{0}[/tex] rejected when [tex]H_{0}[/tex] is false -> Correct decision.
So according to question null hypothesis is rejected so we have two options Either Null hypothesis is present or not present.
if it is present then it is Type i Error.
if it is not present then it is Correct decision.
So when the null hypothesis is rejected possible a Type i error has occurred.
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Please help me!
If f(x) = 3x^2 -3 then what is f(4)?
Show work
Answer:
f(4)= 45
Step-by-step explanation:
f(x)=3x^2-3. (1)
f(4)=?
so we have to put x=4 in equation (1)
we get
f(4)=3[(4)^2]-3
f(4) =3(16)-3
f(4)= 48-3
f(4)= 45 Answer...
suppose you live on the moon. how long is a day (i.e., from sunrise to sunrise)? a) 23 hours 56 minutes b) 24 hours c) a lunar month d) a year e) about 18 years
If we live on the moon, a day on the Moon is about a lunar month long
The correct answer is an option (c)
We know that a day is the length of time between two noons or sunsets. A day is of 24 hours on Earth and 708.7 hours (which is 29.53 Earth days) on the moon.
We know that a lunar month is nothing but the time the Moon takes to go around the Earth.
A lunar month is of approximately 29.53 days.
This means, a day on the Moon is about a lunar month.
Therefore, a day on the Moon is of 708.7 hours i.e., about a lunar month.
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the trade magazine qsr routinely checks the drive-through service times of fast-food restaurants. % confidence interval that results from examining customers in taco bell's drive-through has a lower bound of seconds and an upper bound of seconds. complete parts (a) through (c). question content area bottom part 1 (a) what is the mean service time from the customers? the mean service time from the customers is enter your response here seconds
The mean service time from the customers are between 161.5 to 164.7 seconds.
The trade magazine QSR routinely checks the drive-through service times of fast-food restaurants.
A 90% confidence interval that results from examining 607 customers in Taco Bell's drive-through has a lower bound of 161.5 seconds and an upper bound of 164.7 seconds.
Let's denote the mean service time by μ. Then, note that, we are given that n=607. Also, we are said that a 90% CI for μ is given by
(161.5,164.7)
This implies that we are 90% confident that μ lies in the interval. Or to be precise, this interval is a realization of a random interval that has 90% probability of covering the true mean. Thus, we are 90% confident that the mean service times of the restaurants are between 161.5 to 164.7 seconds.
Hence the answer is The mean service time from the customers are between 161.5 to 164.7 seconds.
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If $a$, $b$, $c$, and $d$ are four different digits from $1$ to $9$, inclusive, then what's the largest possible value for the decimal $a. B + c. D$ ?.
The largest possible value for the decimal $a. B + c. D$ us:
9.7 + 8.6 which results to 18.3.
Given that a, b, c, and d are different numbers (from 1 to 9), we are to find the largest possible value of a.b + c.d.
This problem can be answered by trial and error and with some logic. Clearly, a to d cannot be at the lower end of the values (1 to 5). Since the digits must be different, it can be a combination of digits from 6 to 9.
It is rather tempting to say that the 9.8 + 7.6 would yield the highest possible sum (=17.4) but this is incorrect. Since it is the sum of two numbers with a decimal, we have to maximize on the ones digit first before maximizing the tenths digit. Therefore: the combination of numbers must then be:
9.7 + 8.6 which results to 18.3
9.6 + 8.7 yields 18.3 as well.
Hence we get the required answer,
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