could someone please answer these 3 questions?? ty :))

According to the question we have  the 99% UCB on the mean time of the race is 223.

The formula for finding the upper confidence bound (UCB) is UCB = Mean + (Zα/2)(σ/√n), where Mean is the sample mean, Zα/2 is the z-score for the desired level of confidence, σ is the population standard deviation (which is not given, so we'll use the sample standard deviation instead), and n is the sample size.

We are given the sample of times as follows:137, 143, 153, 162, 168, 176, 190, 192, 196, 203, 218, 223, 236, 243, 252, 269, 271, 276, 283, 287.

We'll need to calculate the sample mean and standard deviation before we can find the UCB. Using a calculator, we get: mean ≈ 207.65s ≈ 48.41 Next, we'll use a table or calculator to find the z-score for a 99% confidence interval, which is Zα/2 = 2.576.

Now we can plug in the values we know to get the UCB:UCB = mean + (Zα/2)(σ/√n)UCB ≈ 207.65 + (2.576)(48.41/√20)UCB ≈ 223.02 .Therefore, the 99% UCB on the mean time of the race is 223.

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Answer:

51.15 cm

Step-by-step explanation:

Data provided

Basin = 40 centimeters deep

The Angle between the sloping sides = 77°

The calculation of the shortest distance between the tip of the cone and its rim is shown below:-

The angle will get divided and the angle is as follows

\(\frac{77^\circ}{2}=38.5^\circ\)

Here In the first triangle, we will follow "Cosine formula" which follows:-

\(\cos 38.5^\circ=\frac{Base}{Hypotenuse}\)

\(cos 38.5^\circ=\frac{40}{Hypotenuse}\)

\(\\\\0.782=\frac{40}{Hypotenuse}\)

\(\\\\Hypotenuse=\frac{40}{0.782}\)

\(=51.15\ cm\)

Answer:

D. 51.1 centimeters

Step-by-step explanation:

Correct for plato users

Using the normal distribution, it is found that 1234 pairs of jeans produced separates the lowest 33% of the means of jean production from the highest 67% in a sampling distribution of 12 factories.

The z-score of a measure X of a normally distributed variable with mean \(\mu\) and standard deviation \(\sigma\) is given by:

\(Z = \frac{X - \mu}{\sigma}\)

For this problem, the parameters are given by:

\(\mu = 1250, \sigma = 125, n = 12, s = \frac{125}{\sqrt{12}} = 36.08\)

The desired amount is the 33rd percentile, which is X when Z = -0.44, hence:

\(Z = \frac{X - \mu}{\sigma}\)

By the Central Limit Theorem

\(Z = \frac{X - \mu}{s}\)

-0.44 = (X - 1250)/36.08

X - 1250 = -0.44 x 36.08

X = 1234.

1234 pairs of jeans produced separates the lowest 33% of the means of jean production from the highest 67% in a sampling distribution of 12 factories.

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Answer:

Im stupid so dont trust me but imma guess and say c

Answer:

YEH its B X to the second power Plus 10

Step-by-step explanation:

Answer:

3)

Step-by-step explanation:

Draw the graph and youll see

Answer:

Exponential growth function

Step-by-step explanation:

It multiplies by 3 each time

Answer:

the answer is A. 2 thin crust pizzas

Answer:

Graph this points u will get the line.

(0,2) (2/5,0)

Step-by-step explanation:

The intercept of line with x-axis is at (0.4, 0) and with y-axis is at (0, 2).

The collection of all coordinates in the planar of the format [x, f(x)] that make up a variable function's graph.

The equation of the line is given below.

y = – 5x + 2

Put y = 0, then the x-intercept will be

0 = – 5x + 2

x = 2/5

x = 0.4

The x-intercept is (0.4, 0).

Put x = 0, the y-intercept will be

y = – 5(0) + 2

y = 2

The y-intercept is (0.4, 0).

Then the equation of line is drawn below.

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\( \sqrt{32} \times \sqrt{ \frac{1}{18} } \\ = \sqrt{32} \times \frac{ \sqrt{1} }{ \sqrt{18} } \\ = \sqrt{32} \times \frac{1}{ \sqrt{18} } \\ = \frac{\sqrt{2 \times 2 \times 2 \times 2 \times 2}}{ \sqrt{2 \times 3 \times 3} } \\ = \frac{ \sqrt{ {2}^{2} \times {2}^{2} \times 2} }{ \sqrt{2 \times {3}^{2} } } \\ = \frac{2 \times 2 \times \sqrt{2} }{3 \times \sqrt{2} } \\ = \frac{4 \times \sqrt{2} }{3 \times \sqrt{2} } \\ = \frac{4}{3} \)

\( \frac{4}{3} \)

ray4918 here to help

Answer:

18.84 inches

Step-by-step explanation:

circumference of a circle = diameter x pi

diameter = radius x 2

==> circumference = radius x 2 x pi = 3 in x 2 x 3.14 = 18.84 in

Answer: a. 18 teaspoons

b. 6 tablespoons

Step-by-step explanation:

a. 1 tsp: 15 sq ft

270 sq ft * 1 tsp/15 sq ft=

270 * 1/15=

270/15=18 teaspoons

b. 3 tsp = 1 tbsp

18 tsp * 1 tbsp/3 tsp=

18 * 1/3=

18/3=6 tablespoons

Answer:

Given:

Initial mass = 18 g

k-value = 0.1226

The mass at time t (days) is

At half life, m = 18/2 = 9 g.

The time for half life is given by

Therefore

ln(1/2) = -0.1226t

Hence obtain

t = ln(1/2) / -0.1226

 = 5.654 days

Answer: 5.7 days (nearest tenth)

or

For this problem, we use the formula for radioactive decay which is expressed as follows:

An = Aoe^-kt

where An is the amount left after time t, Ao is the initial amount and k is a constant.

We calculate as follows:

A0 = 18

An = 18/2 = 9

k = 0.125

9 = 18 e^-0.125t

0.5 = e^-0.125t

t = 5.55 days

Answer:

20.4

Step-by-step explanation:

104 ÷ 5.1 = 20.3921

20.39 = 20.4

In order to place 8 distinguishable rooks on an 8x8 chessboard without any of them being able to capture each other, you will need to ensure that each rook occupies a unique row and column.

Step 1: Place the first rook. There are 8 different locations to choose from (one in each row).
Step 2: Place the second rook. There are 7 remaining locations to choose from, as you cannot place it in the same row or column as the first rook.
Step 3: Place the third rook. There are 6 remaining locations to choose from, avoiding the rows and columns of the first two rooks.
Step 4: Continue this process until all 8 rooks have been placed.

To find the total number of ways to place the 8 distinguishable rooks, multiply the number of choices for each step:

8 (choices for rook 1) * 7 (choices for rook 2) * 6 (choices for rook 3) * 5 (choices for rook 4) * 4 (choices for rook 5) * 3 (choices for rook 6) * 2 (choices for rook 7) * 1 (choice for rook 8) = 40,320 ways.

To solve this problem, we can use the principle of multiplication. We start by placing the first rook in any of the 64 squares on the chessboard. There are 64 choices for the first rook.

Next, we need to place the second rook in a location that is not attacked by the first rook. Since rooks can attack any square in the same row or column as them, we need to choose a square that is not in the same row or column as the first rook. There are 7 rows and 7 columns remaining, so there are 14 squares in which the second rook can be placed.

For the third rook, we need to choose a location that is not attacked by either the first or second rook. This means we need to choose a square that is not in the same row or column as the first two rooks. There are 6 rows and 6 columns remaining, so there are 12 squares in which the third rook can be placed.

Continuing in this way, we see that the number of choices for the nth rook is equal to the number of rows and columns remaining after the (n-1)th rook has been placed. So, the total number of ways to place all 8 rooks on the chessboard is:

64 × 14 × 12 × 10 × 8 × 6 × 4 × 2 = 16,777,216

Therefore, there are 16,777,216 ways to place 8 distinguishable rooks on an 8 × 8 chessboard so that none can capture any other.

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Answer:

X is equal to 1.2

Step-by-step explanation:

6/5 equals 1.2

i don't have to sound rude but can i have brainliest please i need 4 more :')

A. \( \frac{57u}{4} + 36\) ✅

Step-by-step explanation:

\(6( \frac{5}{8} u + 1) - 6( \frac{ - 7}{4} u - 5) \\ = \frac{30u}{8} + 6 + \frac{42u}{4} + 30 \\ = \frac{15u}{4} + \frac{42u}{4} + 36 \\ = \frac{15u + 42u}{4} + 36 \\ = \frac{57u}{4} + 36\)

\(\circ \: \: { \underline{ \boxed{ \sf{ \color{green}{Happy\:learning.}}}}}∘\)

For given function g(x) = x^4 - 2x^3 - 3x the value of x such that g'(x) = 12 is x = 2.24

In this question, we have been given a function g(x) = x^4 - 2x^3 - 3x

We need to find the value of x such that g'(x) = 12

First we find the derivative of given function g(x) with respect to x

g'(x) = 4x³ - 6x² - 3

When g'(x) = 12

4x³ - 6x² - 3 = 12

4x³ - 6x² - 3 + 3 = 12 + 3

4x³ - 6x² - 15 = 0

After solving given polynomial we get,

x = 2.24

Therefore,  the value of x is 2.24

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Answer:

f^-1 = 3(x + 1)

Step-by-step explanation:

f(x) = (3 - x)/x

y = (3 - x)/x

x = (3 - y)/y

xy = 3 - y

xy + y = 3

y(x + 1) = 3

y = 3/(x + 1)

f^-1 = 3(x + 1)

Answer:

parallelogram

Step-by-step explanation:

Answer:

parallelogram

Step-by-step explanation:

did the test

Answer:

savage love

Step-by-step explanation:

Answer:

75

Step-by-step explanation:

4(1/2*5*5) +5*5 = 75

Four triangles plus the square = surface area

a) 9 hikers  bare least that might have covered the distance, which is within the usual range of 10 ≤ x ≤ 15.

b) The most hikers who might have covered the distance between 6 and 17 miles is 19.

Rearrange the function using fundamental algebraic concepts to get the value of x when the derivative equals 0. This response gives the x-coordinate of the function's vertex, which is where the maximum or minimum will occur. To find the minimum or maximum, rewrite the solution into the original function.

Part a)

common interval of 10 ≤ x ≤ 15.

the minimum number of hikers who could have walked between 6 miles and 17 miles =9

Part b)

common interval of 10 ≤ x ≤ 15.

the maximum number of hikers who could have walked between 6 miles and 17 miles is 19.

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The complete question is:

The table below shows information about the distance walked by some hikers.

a) Work out the minimum number of hikers who could have walked between 6 miles and 17 miles.

b) Work out the maximum number of hikers who could have walked between 6 miles and 17 miles.

Image is attached below.

Rounding this to the nearest hundredth, the area of the sector is approximately 28.88 f\(t^2\).

To find the area of a sector, we can use the formula:

Area = (θ/360) × π × \(r^2\)

where θ is the central angle in degrees, π is approximately 3.14, and r is the radius.

Given a central angle of 131° and a radius of 7.2 ft, we can plug in these values into the formula to find the area:

Area = (131/360) × 3.14 × (7.2\()^2\)

Calculating this expression:

Area = (0.3639) × 3.14 × (7.2\()^2\)

Area ≈ 28.879 f\(t^2\)

Rounding this to the nearest hundredth, the area of the sector is approximately 28.88 f\(t^2\).

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The most common type of observational study is a Survey.

Observe the change in behavior of the independent variable. Don't add prejudice. Use surveys to get information about variables.

In the study, the independent variable is observed only for its behavior. Variables naturally exhibit variation. Researchers must not be biased when conducting research. Fundamentally, surveys help us obtain information about social parameters.

Step: 1

An experiment is a well-planned study of any particular cause and effect relationship between variables of interest. A debate is the form of discussion in which a conclusion is to be summarized at last. The statistical inference is a very crucial subject involving the predictions about population parameters based on sample statistics. The survey is the method of collection of information on variables which are not under the control of the experimenter.

The analysis defines various terminologies intermixed with the right answer to the question of interest.

Step: 2

An observational study is mostly conducted in the form of questionnaire. The questionnaire involves question regarding the issue to be studied. The most common type of observational study is a Survey.

Most of the observational studies are carried out in the form of surveys.

The most common type of observational study is a Survey.

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Answer:

-1+2p)(3-4p)=

Step-by-step explanation:

is the best one

can i be marked brainlest plz

Answer:

The equation is Linear

Step-by-step explanation:

Answer: x

Step-by-step explanation:

Answer:

4x 9y

Step-by-step explanation:

3x 4y 5y x

combine your exponets

3x 4y 5y x

4x 4y 5y

combine again

4x 4y 5y

4x 9y

The value of a such that the line x = a bisects the area under the curve y = 1/x² for 1 ≤ x ≤ 4 is a = 1 or a = 4.

To solve the problem, we can use the formula for the area under the curve, which is given by the integral of the function f(x) with respect to x over a specified interval.

We need to find the value of a such that the line x = a bisects the area under the curve y = 1/x² for 1 ≤ x ≤ 4. This means that the area under the curve for x = a and 1 ≤ x ≤ 4 should be equal to half of the total area under the curve.

Given function: f(x) = 1/x²

The area under the curve between the limits 1 and 4 can be calculated as follows:

∫[1,4] f(x) dx = ∫[1,4] 1/x² dx

Integrating the function, we have:

∫[1,4] 1/x² dx = [-1/x] [1,4] = (-1/4) - (-1/1) = 3/4

Now, we need to find the value of a such that the area under the curve between the limits 1 and a, and a and 4, are both equal to 3/8.

Let the area under the curve from 1 to a be A1, and from a to 4 be A2.

The area under the curve between 1 and a can be calculated as:

A1 = ∫[1,a] f(x) dx = ∫[1,a] 1/x² dx = [-1/x] [1,a] = 1 - 1/a = (a-1)/a

The area under the curve between a and 4 can be calculated as:

A2 = ∫[a,4] f(x) dx = ∫[a,4] 1/x² dx = [-1/x] [a,4] = 1/a - 1/4 = (4-a)/4

Since the given condition states that the area under the curve between 1 and a should be equal to the area under the curve between a and 4, we have:

A1 = A2

(a-1)/a = (4-a)/4

Cross-multiplying, we get:

4a - 4 = a² - a

Rearranging the equation, we have:

a² - 5a + 4 = 0

Factoring the equation, we get:

(a-1)(a-4) = 0

Therefore, the values of a that satisfy the equation are a = 1 or a = 4.

In summary, the value of a such that the line x = a bisects the area under the curve y = 1/x² for 1 ≤ x ≤ 4 is a = 1 or a = 4.

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Answer:

center: (4,1/2)

radius: .5

Step-by-step explanation:

Group the x and y variables and move the constant (16) to the other side

(x²-8x)+(y²-y)= -16

We need to do something called "completing the square" we do this by taking the b term, dividing it by two and then squaring it

so for (x²-8x) we would take (8/2)² and then add that to both sides we have

(x²-8x+16)+(y²-y+.25)= -16+16+.25

next, we need to factor the x and y groups

(x-4)²+(y-.5)²= .25

Now that we have our equation we can easily find the center and radius

the center is just the constant's sign flipped or (4,.5) and the radius is the square root of the constant on the other side or √.25= .5