1. There are 5,565 ways to choose 3 students.
Given:
Number of boys = 18
Number of girls = 17
Number of ways to choose 3 students:
This can be calculated using the combination formula:
[tex]nCr = n!/(r!(n-r)!)[/tex]
where n is the total number of students and r is the number of students to be chosen.
In this case, the number of ways to choose 3 students from a total of 35 students (18 boys + 17 girls) is:
[tex]35C3=35!/(3!(35-3)!)=35!/(3!*32!)= 35*34*33/(3*2*1)=5,565[/tex]
2. The probability that the first three children chosen are boys is approximately 0.1467.
Number of ways the first three children chosen can be boys:
Since there are 18 boys in the classroom, the number of ways to choose 3 boys from them is:
[tex]18C3 =18!/(3!(18-3)!=18!/(3!*15!) = 18*17*16/(3*2*1)= 816[/tex]
Therefore, there are 816 ways to choose the first three children as boys.
Now, to calculate the probability:
Probability = (Number of ways the first three children chosen can be boys) / (Number of ways to choose 3 students)
= 816 / 5565
≈ 0.1467 (rounded to four decimal places)
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Daniel is baking cookies but does not have all of the he needs. The ratio of flour:sugar in his recipe is 3:2cups. If he only has 1.5cups of sugar, how much flour should he use to keep the ratio the same?
Answer:
Step-by-step explanation:
3:2 = 2.5:1.5
half of 2 is 1 so if you had 1.5 it would only be half. For a better explanation, 1 minute is 60 seconds half of a minute is 30 seconds. if you have 45 seconds it would be 3/4 of a second. this is hard for me to explain so if you need more examples just tell me in the comments.
i hope this helps
have a nice day/night
mark brainliest please:)
HELP I NEED HELP ASAP
HELP I NEED HELP ASAP HELP I NEED HELP ASAP
HELP I NEED HELP ASAP HELP I NEED HELP ASAP
HELP I NEED HELP ASAP
Answer:
i think the answer would be A
WILL MARK BRANLIEST
What is true about the decimal form of an irrational number ?
A) The decimal both repeats and terminates
B) The decimal does not repeat or terminate
C) The decimal repeats
D) The decimal terminates
Therefore, the decimal representations of irrational numbers satisfy conditions 1 and 2; that is, irrational numbers are decimals that do not terminate and do not repeat. Knowing these properties, it is now possible for us to construct irrational numbers in decimal form at will.
for spanish people
Por lo tanto, las representaciones decimales de números irracionales cumplen las condiciones 1 y 2; es decir, los números irracionales son decimales que no terminan y no se repiten. Conociendo estas propiedades, ahora es posible para nosotros construir números irracionales en forma decimal a voluntad.
The measure of ∠CBD is 45% of the measure of ∠ABC. Find the value of x.
Answer:
x = 49.5°
Step-by-step explanation:
∠ABC = 90°
∠CBD = 45%∠ABC
∠CBD = 0.45(90)
∠CBD = 40.5°
x = ∠ABC - ∠CBD
x = 90 - 40.5
x = 49.5°
Timothy wanted to get some exercise. He walked 12 blocks in 10 minutes. What was his average speed of his walk?
Answer: 1.2 blocks
Step-by-step explanation:
Timothy walks 12 blocks in 10 minutes so it can be written as
12 blocks = 10 minutes
divide both sides by 10
1.2 blocks per minute
A cruise ship heads due west from a port 3 miles directly south of San Francisco. If the ship is travelling at a constant rate of 17 mph, how fast is the distance between the ship and San Francisco changing 1 hour after leaving port? Round your answer to the nearest tenth.
If the ship is travelling at a constant rate of 17 mph, the distance between the ship and San Francisco is changing at a rate of approximately 1 mile per hour. So, the rate of change is 1mph.
What is the concept of related rates?
The concept of related rates is a fundamental topic in calculus that deals with how the rates of change of different variables are related to each other. It involves analyzing how the rates of change of two or more related quantities are connected through their derivatives.
To solve this problem, we can use the concept of related rates. Let's assume that the cruise ship starts at point A, the port 3 miles directly south of San Francisco, and moves towards the west.
Let's denote the position of the cruise ship at a given time as point B. We are interested in finding the rate at which the distance between point B and San Francisco (let's call it point C) is changing.
We can create a right triangle with points A, B, and C, where the distance between A and C is the constant 3 miles. Let's call the distance between B and C as "x" (in miles).
We are given that the ship is traveling at a constant rate of 17 mph, which means its speed is 17 miles per hour.
To find how fast the distance between the ship and San Francisco is changing, we need to find dx/dt (the rate at which "x" is changing) when 1 hour has passed.
Using the Pythagorean theorem, we have:
[tex]x^2 + 3^2 = (distance\ traveled \ by\ the\ ship)^2[/tex]
Taking the derivative of both sides with respect to time (t):
2x(dx/dt) = 2(distance traveled by the ship)(speed of the ship)
Plugging in the given values:
2x(dx/dt) = 2(17 mph)
Simplifying:
x(dx/dt) = 17 mph
Now, we need to find x when 1 hour has passed. The ship is traveling at a constant speed of 17 mph for 1 hour, so the distance it travels is 17 miles.
Plugging in x = 17 and solving for dx/dt:
17(dx/dt) = 17 mph
dx/dt = 1 mph
Therefore, 1 hour after leaving port, the distance between the ship and San Francisco is changing at a rate of approximately 1 mile per hour.
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I suckkk at math.. Help?
Answer:
B. x=6
Step-by-step explanation:
substitute -7 into 2y to get -14. your new equation should be 4x-14=10. add 14 to both sides to get 4x=24, divide both sides by 4 to get x=6.
Answer:
B. 6
Step-by-step explanation:
y = -7
4x + 2(-7) = 10
4x + (-14) = 10
4x = 10 - (-14)
4x = 24
x = 6
Which equation best represents the graph?
A new car is valued at $28,000. It increases 9% per year. What is the total value of the car two year after purchase?
Answer:
$33,040
Step-by-step explanation:
Hope this helps and have a wonderful day!!!
Answer:
$30520
Step-by-step explanation:
Solve 3(2x - 7)<4x - 8
Answer:
x < 6.5
Step-by-step explanation:
3(2x - 7) < 4x - 8
6x - 21 < 4x - 8
6x - 4x < -8 + 21
2x < 13
x < 6.5
[48 (72-12) -225] ÷ 9
someone pls help
Answer:
295
Step-by-step explanation:
Answer:
295!
Step-by-step explanation:
72 - 12 = 60
48 x 60 = 2880
2880 - 225 = 2655
2655 / 9 = 295
Have you ever heard of PEMDAS? It is the order in which to solve equations like this one. Here's what it stands for:
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction
I hope this is helpful for future math equations similar to this one.
13. Which graph best represents -5y = -6x + 15?
А
Help ASAP !!!
Find the distance between the set of points (-4,5) and (4,0)
Answer:
√89
Step-by-step explanation:
√(4+4)2+(0-5)2
√(8)2+(-5)2
√64+25
√89
6n-18n-18=6 slove by factoring
Answer:n=−2
Step-by-step explanation:
Is the equation cosine theta - sine theta =1 an identity? Explain
Janice wants to go to the Sadie Hawkins dance. The probability of a random boy saying yes is 45%. How many does she need to be willing to ask to have a 99.7% chance of going?
Janice needs to be willing to ask at least 16 boys to have a 99.7% chance of getting a "yes" and going to the Sadie Hawkins dance.
To determine how many boys Janice needs to be willing to ask in order to have a 99.7% chance of getting a "yes" and going to the Sadie Hawkins dance, we can use the concept of probability and the binomial distribution.
The probability of a random boy saying yes is 45%, which means the probability of a boy saying no is 55%. Let's assume Janice asks "n" boys.
The probability of at least one boy saying yes can be calculated using the complement rule. The complement of the event "at least one boy saying yes" is the event "all boys saying no."
The probability of all "n" boys saying no is (0.55)^n, as the probability of each boy saying no is 55%.
To find the number of boys Janice needs to ask to have a 99.7% chance of going, we want the complement probability (all boys saying no) to be 0.003. Therefore:
(0.55)^n ≤ 0.003
Taking the logarithm of both sides:
n * log(0.55) ≤ log(0.003)
Solving for "n":
n ≥ log(0.003) / log(0.55)
Using a calculator:
n ≥ 15.154
Since Janice can't ask a fraction of a boy, we need to round up the value of "n" to the nearest whole number.
Therefore, Janice needs to be willing to ask at least 16 boys to have a 99.7% chance of getting a "yes" and going to the Sadie Hawkins dance.
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Can someone please help me on this and show work if you can? Thanks!
Answer:
area = 18.81 m²
Step-by-step explanation:
solving for the 7 sided polygon first:
divide into 7 equal isosceles triangles, each having sides of 10 m and a peak angle of 360°/7 = 51.43°. Drop a line from the peak & perpendicular to the base makes a right triangle with a 25.71° peak angle and a 10 m hypotenuse.
sin 25.71° = x/10, x = 4.34, the base of the full triangle will be 2 x 4.34 = 8.68 m
cos 25.71° = x/10, x = 9.01, the rise of the triangle is 9.01 m
The area of each triangle will be 1/2(8.68)(9.01) = 39.10 m²
39.10 x 7 triangles = 273.72 m²
area of 7 sided polygon = 273.72 m²
Next solve for the inner circle:
The rise of the triangle (9.01) is the radius of the inner circle.
area of inner circle = πr² = 3.14(9.01²) = 254.91 m²
273.72 - 254.91 = 18.81 m²
find the slope of the points 2,8 and 12,55
Answer:
m = 4.7
Step-by-step explanation:
If you plug in these values in the slope formula, this is what happens:)
Answer:
47/10x
**Do not leave your answer as a decimal, slope is usually in fraction form**
Step-by-step explanation:
Slope Formula: [tex]\frac{\text{rise}}{\text{run}} / \frac{y_2 - y_1}{x_2 - x_1}[/tex] In this formula, subtract the 1st coordinate from the second. So, the 2nd y coordinate goes first, place a "minus" sign, and then the 2nd y-coordinate. This is the same for the x coordinates.
Finding the Answer: To find the answer, we just plug the numbers correctly into the equation, just as I explained above. We would do 55-8 first, which is 47, and then 12-2 which is 10.
Combined, the answer is 47/10x. You always place an x after the slope, which can be used to plug in other numbers. The answer cannot be simplified anymore, so this is simplfied.
A vending machine dispenses coffee into a twenty-ounce cup. The amount of coffee dispensed into the cup is normally distributed with a standard deviation of 0.03 ounce. You can allow the cup to overfill 4% of the time. What amount should you set as the mean amount of coffee to be dispensed? Click to view page 1 of the table. Click to view page 2 of the table. 19.9 ounces
The mean amount of coffee to be dispensed should be set at μ + 0.0525 ounce, where μ represents the original mean amount of coffee. This ensures that the cup overfills only 4% of the time.
To determine the mean amount of coffee to be dispensed, we need to find the value that corresponds to the 96th percentile of the normal distribution. This value represents the amount of coffee that should not be exceeded 96% of the time.
Using a standard normal distribution table or a calculator, we find that the z-score corresponding to the 96th percentile is approximately 1.75.
Since the standard deviation is given as 0.03 ounce, we can set up the equation:
1.75 = (x - μ) / 0.03
Solving for x, the mean amount of coffee to be dispensed, we get:
x - μ = 1.75 * 0.03
x - μ = 0.0525
x = μ + 0.0525
Therefore, the mean amount of coffee to be dispensed should be set at μ + 0.0525 ounce to ensure that the cup overfills only 4% of the time.
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3. Savannah estimates that her dog weights 30
pounds. When she takes her dog to the vet for
his check-up, the dog is placed on the scale and
actually weights 32.5 pounds. What was
Savannah's percent of error of her estimate?
Round to the nearest percent.
Answer:
8%
Step-by-step explanation:
STRESSING OUT ABOUT THIS ONE
I had this one before. I'm pretty sure it is 1.61
Answer:
1.61
Step-by-step explanation:
It just makes since.
In a diving meet, you score 8.4 and 7.88.
What is your total score?
Answer: 16.28?
Step-by-step explanation:
The illustration below shows the graph of yyy as a function of xxx.
Complete the following sentences based on the graph.
Initially, as xxx increases, yyy
.
Afterward, the slope of the graph of the function is equal to
for all xxx between x=3x=3x, equals, 3 and x=5x=5x, equals, 5.
The slope of the graph is equal to
for xxx between x=5x=5x, equals, 5 and x=9x=9x, equals, 9.
The greatest value of yyy is y=\:y=y, equals
, and it occurs when x=\:x=x, equals
.
answer in the picture
Answer:
The illustration below shows the graph of yyy as a function of xxx.
Complete the following sentences based on the graph.
Initially, as xxx increases, yyy
Step-by-step explanation:
Can someone help me with this problem
Answer:
51 degrees
Step-by-step explanation:
As we already know that this triangle is a right triangle.
To find x, you need to subtract both angles.
90 - 39
= 51
I Need Answers Quick
Answer:
42.78cm2
Step-by-step explanation:
Area =100°/360 * 22/7 * 7^2
=42.78cm2
The U.S. Energy Information Agency reported that the mean monthly household electric bill in the United States in a recent year was $110.14. Assume the amounts are normally distributed with standard deviation $20.00. a. Find the 7th percentile of the bill amounts. b. Find the 62nd percentile of the bill amounts c. Find the median of the bill amounts.
a) The 7th percentile of the bill amounts is given as follows: $80.64.
b) The 62nd percentile of the bill amounts is given as follows: $116.24.
c) The median of the bill amounts is given as follows: $110.14.
How to obtain probabilities using the normal distribution?We first must use the z-score formula, as follows:
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
In which:
X is the measure.[tex]\mu[/tex] is the population mean.[tex]\sigma[/tex] is the population standard deviation.The z-score represents how many standard deviations the measure X is above or below the mean of the distribution, and can be positive(above the mean) or negative(below the mean).
The z-score table is used to obtain the p-value of the z-score, and it represents the percentile of the measure represented by X in the distribution.
The mean and the standard deviation for this problem are given as follows:
[tex]\mu = 110.14, \sigma = 20[/tex]
The median is the same as the mean, hence it is given as follows:
$110.14.
The 7th percentile is X when Z = -1.475, hence:
-1.475 = (X - 110.14)/20
X - 110.14 = -1.475 x 20
X = $80.64.
The 62nd percentile is X when Z = 0.305, hence:
0.305 = (X - 110.14)/20
X - 110.14 = 0.305 x 20
X = $116.24.
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An online store sold a gift basket at five different prices and recorded the number of gift baskets that were sold at each price. The results are shown in the scatterplot.
Complete question :
An online store sold a gift basket at five different prices and recorded the number of gift baskets that were sold at each price. The results are shown in the scatterplot.
Which statement is correct based on the scatterplot?
There is no relationship between price and gift baskets sold because the points do not form a straight line.
There is no relationship between price and gift baskets sold because there are multiple prices at which 80 gift baskets were sold.
There is a relationship between price and gift baskets sold, and the relationship is that as the price increases, the gift baskets sold increases.
There is a relationship between price and gift baskets sold, and the relationship is that as the price increases, the gift baskets sold decreases.
Answer:
There is a relationship between price and gift baskets sold, and the relationship is that as the price increases, the gift baskets sold decreases.
Step-by-step explanation:
From the scatterplot provided, it could be observed thatbthere is a linear trend in the plot created. This shows that there is a relationship between the price of gifts and the number if gift basket sold.
Furthermore, the slope of the linear trend line that could be drawn from the plotted data is negative, A negative slope Indicates a negative relationship, that is an increase in x leads to corresponding decrease in y. He ce, as price increases the number sold decreases
Answer:
d and/ or the other dude
Step-by-step explanation:
what is the degree form for 3π/4 radians? enter your answer in the box.
The degree form for 3π/4 radians is 135°.The degree form for 3π/4 radians is 135°. To convert radians to degrees, we multiply the radian measure by the conversion factor of 180°/π.
In this case, we have (3π/4) * (180°/π) = (3 * 180°) / 4 = 540° / 4 = 135°. Therefore, 3π/4 radians is equivalent to 135° in the degree form.
To convert an angle from radians to degrees, we use the conversion factor of 180°/π. This conversion factor represents the relationship between a full circle (360°) and 2π radians.
In this case, we want to convert the angle 3π/4 radians to degrees. We multiply the radian measure (3π/4) by the conversion factor (180°/π):
(3π/4) * (180°/π) = (3 * 180°) / 4 = 540° / 4 = 135°
By canceling out the common factor of π and simplifying the expression, we find that 3π/4 radians is equal to 135°.
Therefore, the degree form of the angle 3π/4 radians is 135°.
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The temperature at sunrise is 40°F. Each hour, the temperature rises 4°F. Write an equation that models the temperature y, in degrees Fahrenheit, after x hours. What is the graph of the equation?
Write an equation that models the temperature y, in degrees Fahrenheit, after x hours.
Answer:
y = 4x + 40
Step-by-step explanation:
At sunrise, 0 hours have passed, meaning x = 0.
When x = 0, the temperature is 40, meaning that 40 is the y-intercept.
And every x hours the temperature rises by 4 degrees F
You are interested in estimating the mean age of the citizens living in your community. In order to do this, you plan on constructing a confidence interval; however, you are not sure how many citizens should be included in the sample. If you want your sample estimate to be within 3 years of the actual mean with a confidence level of 98%, how many citizens should be included in your sample? Assume that the standard deviation of the ages of all the citizens in this community is 22 years.
71 citizens should be included in the sample to estimate the mean age of the citizens living in your community at a 98% level of confidence.
We need to find out the sample size of citizens that should be included in the sample to estimate the mean age of the citizens living in your community at a 98% level of confidence.
The formula for the Margin of error is
E: E = Zc/2 * (σ/√n)
Where E is the margin of error Zc/2 is the Z-value for the level of confidence cσ is the population standard deviation is the sample size.
So the formula for the sample size n is: n = (Zc/2 / E)² * σ²
We have Zc/2 = Z0.02/2 = Z0.01 = 2.33 (using z-table) σ = 22 years
E = 3 years
n = (2.33 / 3)² * 22²
n ≈ 70.36 ≈ 71 (rounded up)
Therefore, 71 citizens should be included in the sample to estimate the mean age of the citizens living in your community at a 98% level of confidence.
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