help fast and thanks and whoever's reading this have a nice night​

Answer:

x = 5

y = 1

Step-by-step explanation:

2x - y = 9

3x + 4y = 19

We multiply the first equation by 4

8x - 4y = 36

3x + 4y = 19

11x = 55

x = 5

Now we put 5 in for x and solve for y

2(5) - y = 9

10 - y = 9

-y = -1

y = 1

Let's Check the answer

2(5) - 1 = 9

10 - 1 = 9

9 = 9

So, x = 5 and y = 1 is the correct answer.

The work required to pump the water out of the spout is approximately 64,307,077 ft-lb

To find the work required to pump the water out of the spout, we need to calculate the weight of the water in the tank and then convert it to work using the formula: work = force × distance.

First, let's calculate the volume of water in the tank. The frustum of a cone can be represented by the formula: V = (1/3)πh(r1² + r2² + r1r2), where r1 and r2 are the radii of the two bases and h is the height.

Given r1 = 3 ft, r2 = 6 ft, and h = 12 ft, we can calculate the volume:

V = (1/3)π(12)(9 + 36 + 18) = 270π ft³

Now, we can calculate the weight of the water using the density of water:

Weight = density × volume = 62.5 lb/ft³ × 270π ft³ ≈ 53125π lb

Next, we convert the weight to force by multiplying it by the acceleration due to gravity (32.2 ft/s²):

Force = Weight × acceleration due to gravity = 53125π lb × 32.2 ft/s² ≈ 1709125π lb·ft/s²

Finally, we can calculate the work by multiplying the force by the distance. Since the water is being pumped out of the spout, the distance is equal to the height of the frustum, which is 12 ft:

Work = Force × distance = 1709125π lb·ft/s² × 12 ft ≈ 20509500π lb·ft ≈ 64307077 lb·ft

for more search question water  

https://brainly.com/question/17120212

#SPJ8

Lucas read

Therefore, Lucas presents a constant read rate.

Brianna read

Therefore, Brianna does not present a constant read rate.

Which of the tables, if any, shows a proportional relationship?

Lucas's table presents a constant read rate - 26 pages/hour.

Second question about strategy

9514 1404 393

Answer:

  12.5 square inches

Step-by-step explanation:

The area of the base can be written as ...

  B = LW

Then the volume formula ...

  V = LWH

can be written in terms of the base area as ...

  V = BH

The base area can be found by dividing by the height:

  B = V/H = (50 in³)/(4 in) = 12.5 in²

The area of the base is 12.5 square inches.

To find the number of temperatures in the set, we can divide the sum of the temperatures by the mean temperature.

Number of temperatures = Sum of temperatures / Mean temperature

In this case, the sum of temperatures is given as 2,516 and the mean temperature is given as 74 degrees Fahrenheit.

Number of temperatures = 2,516 / 74

Calculating the division:

Number of temperatures ≈ 34.05

Since we cannot have a fraction of a temperature, we need to round the result to the nearest whole number. Therefore, there are approximately 34 temperatures in the set.

Answer:

\(y=5x^2-80x+324\)

Step-by-step explanation:

Answer:

670,000

Step-by-step explanation:

Answer:

670,000

Step-by-step explanation:

674,312 rounded to the nearest ten thousand is 670,000

Another meaning of this term is that the square of a lateral surface is the product of the squares that comprise the other 2 sides plus twice the dimension of the rectangle formed by those two sides.

The Latin word rectus, which meaning "right" or "straight," is where the "recto" in "rectangle" comes from. A rectangle possesses straight sides due to its right angles. Rectitude, a different term derived from the same root and denoting moral uprightness.

This is how the Pythagorean Theorem for just an acute angled triangle is stated.

Assume that ABC is a triangle with an acute angle on angle A. Let the lengths of the sides that are perpendicular to angles A, B, and C be a, b, and c, respectively. Assume, without losing generality, that side an is perpendicular to angle A.

Hence, according to the Pythagorean Theorem for this triangle,

a² = b² + c² + 2bc×cos(A)

Where cos(A) denotes the project of side c onto side b and is the cosine of angle A. You can also write the expression 2bccos(A) as 2bch, where h is the distance from vertex A to side BC.

The Pythagorean Theorem for an obtuse angled triangle state, in plain English, that the square of a longest side (a) is the same as the total of the squares of the remaining two sides (b and c), plus twice equal product of those sides and the cosine of an angle between them. The square of the lateral surface is equal to the sum of the squares that make up the other 2 sides plus twice the size of the rectangle created by those two sides, according to another interpretation of this expression.

To know more about rectangle visit:

https://brainly.com/question/2607596

#SPJ1

Answer:

Yes, because the regression equation is based on the random sample.

Step-by-step explanation:

A simple linear regression model that describes the relationship between X and Y takes the form

Yi= ∝ + βXi + εi or

Y i= U(y.x) + εi

where εi's are the random errors. The random errors εi's are assumed to be independent of Xi and normally distributed with E(εi)= 0 and Var (εi)= σ²(y.x) , a constant for all Xi. These assumptions imply that Yi also have a common variance σ²(y.x) ,  as the only random element in the is  εi.

The estimated regression line Y= a+ bX is also the predictor of Yi= ∝ + βXi+ εi

. That is Y^ can also be used to predict an individual value Y0 of Yi rather than a mean value, corresponding to the given X0. To draw the inferences about Y0 we need to know it mean and variance.

Answer:

E. 12 red, 6 green, 4 blue

Step-by-step explanation:

To find the number of colored pencils for each color, we must find ratios.

480 red: 240 green: 160 blue

Then we divide them to the simplest ratios.

We divide all the numbers by 80.

6 red: 3 green: 2 blue

There are a total of 11 pencils here. To get 22 pencils, you multiply the ratio by 2 to get 22 pencils.

12 red: 6 green: 4 blue

The pencils of each color are 12 red, 6 green, 4 blue. The correct option is E.

The numerical relationship between two values that demonstrates how frequently one value contains or is contained within another.

Given:

Carlos is picking colored pencils from a large bin that contains only 480 red pencils, 240 green pencils, and 160 blue pencils.

Without looking, Carlos pulls out 22 pencils.

The pencils were distributed randomly in the bin.

To find the numbers of pencils of each color:

First, we will find the ratio.

Red : Green : Blue

= 480 : 240 : 160

We will factor out the common factor,

= 12: 6: 4

Therefore, 12 red, 6 green, 4 blue are the pencils of each color.

To learn more about the ratio;

https://brainly.com/question/13419413

#SPJ2

Answer:

option C :11/21

Step-by-step explanation:

option C is the correct answer of this question.

plz mark my answer as brainlist plzzzz vote me also.

Hope this will be helpful to you.

Step-by-step explanation:

C is the correct answer, hope this helps and I luv ur profile pic

Answer:h(x) =-(x+5)^3

Step-by-step explanation:

Answer:

The expression is 26 - s.

Step-by-step explanation:

Number of sour candies Eve has = 26

Number of candies ate by Eve = s

Let,

x be the candies left.

Candies left = Total - candies eaten

x = 26 - s

Therefore,

The expression is 26 - s.

Answer:

\(\frac{\sqrt{3} }{2} }\)

Step-by-step

substitute θ=30° into the expression

like this cos(30°)

and then use a calculator to calculate the expression

= \(\frac{\sqrt{3} }{2} }\)

Answer:

≈ 26.39 inches

Step-by-step explanation:

The circumference of a circle is 2πr or πd with r meaning radius and d for diameter. Since we know the diameter already, we can substitute the value in for d:

C = π(8.4) = 8.4π ≈ 26.39

Answer:

3 hours working on problems, 1 hour reading

Step-by-step explanation:

From the given information:

We learned that If Nick can attempt more than 15 problems in an hour, working on problems will helo and aid further his grade for that particular hour than reading would.

We know that the marginal gain for three hours is greater than 15. This implies that Nick would get better by spending 3 hours on problem-solving and the rest 1 hour on reading since the marginal gain for that an hour is one problem solved. Hence, it will be advisable to spend it on reading.

Answer:

B

Step-by-step explanation:

Standard deviation is the average distance away from the mean, thus B is correct

at least 24 people must be in the party to guarantee that at least 3 people have the same date of birth, date of birth, date of birth.

To warrant that at least three people have the same date, month, and year of birth, we need to find the minimum number of people such that there is a probability that at least three people have the same date, month, and year. there is. Birth year she is 1 or more. Non-leap years have 365 days, and leap years have her 366 days. The birth year range includes two leap years, so there are 3652 + 3662 = 2,922 possible births. This means that the probability that a particular person's birthday is unique is (2922-1)÷2922 = 1÷2922.

Now we can use the birthday puzzle to calculate the probability that at least three people have the same birthday. The probability that no one has the same birthday is (1 - 1÷2922)^n, where n is the number of people in your party. At least he has 1-(1-1÷2922)^n probability that 3 of them have the same birthday. You can set this probability to 1 or more and solve for n.

1 - (1 - 1÷2922)^n >= 1

(1 - 1÷2922)^n <= 0

n >= log(0) ÷ log(1 - 1÷2922)

The logarithm of 0 is not defined, so you can use a small value on the right hand side instead. B. 10^-6. This will tell you:

n >= log(10^-6) ÷ log(1 - 1/2922)

n >= log(10^-6) ÷ log(2921/2922)

n >= log(10^-6) ÷ log(2921) - log(10^-6) / log(2922)

n >= log(10^-6) × log(2922) ÷ log(2921) - log(10^-6)

n >= log(10^-6) × log(2922) ÷ log(2921) - log(10^-6)

n >= 23.

Hence, at least 24 people must be in the party to guarantee that at least 3 people have the same date of birth, date of birth, date of birth.

Read more about this on https://brainly.com/question/9314097

#SPJ4

Step-by-step explanation:

let's create the corresponding equation.

it is linear, because the cost per hour is constant, no matter how many hours the car parks.

t is the variable indicating the amount of hours parking.

every hour costs $2.

and $8 is the starting value (we have to pay that, even if we have 0 hours parking time).

cost(t) = 2t + 8

so, the cost after 3 hours is

cost(3) = 2×3 + 8 = 6 + 8 = $14

Answer:

c. domain: {-2, 0, 2}, range: {-1, 1, 3}

Step-by-step explanation:

From the given points (negative 2, negative 1), (0, 1), (2, 3), we can determine the domain and range.

The domain represents the set of all possible x-values of the points, and the range represents the set of all possible y-values of the points.

In this case, we can see that the x-values are -2, 0, and 2, and the corresponding y-values are -1, 1, and 3.

Therefore, the correct answer is:

c. domain: {-2, 0, 2}, range: {-1, 1, 3}

Given the following vertices:

A (2,-4)

B (1,-1)

C (4,0)

D (5,-3)

Let's plot the following points in the graph to see what type of quadrilateral will ABCD formed from the vertices.

We get,

The figure formed by the vertices appeared to be a square.

Therefore, the quadrilateral ABCD is a square.

Answer:

  18 cubic inches

Step-by-step explanation:

The formulas for the volumes of a cone and a cylinder can be used to answer this question.

The volume of a cone is given by ...

  V = 1/3πr²h . . . . . volume of cone with radius r and height h

The volume of a cylinder is given by ...

  V = πr²h . . . . . volume of a cylinder with radius r and height h

Comparing the formulas, we see that the volume of a cone is 1/3 the volume of a cylinder with the same radius and height.

  (cone volume) = 1/3(cylinder volume)

Multiplying this equation by 3 gives ...

  3×(cone volume) = (cylinder volume)

Using the given value for cone volume, we have ...

  cylinder volume = 3×(6 in³) = 18 in³

The volume of the cylinder is 18 cubic inches.

Answer:

C.

Step-by-step explanation:

In a triangle, the sum of the lengths of any two sides must be greater than the length of the third side.

A.

9 + 9 = 18

18 < 22

No triangle

B.

7 + 3 = 10

10 = 10

No triangle

C.

5 + 6 = 11 and 11 > 9  good

5 + 9 = 14 and 14 > 6  good

9 + 6 = 15 and 15 > 5  good

There is a triangle.

Answer: C.

Answer:

Margin of error for 90% C.I: 0.065

Margin of error for 99% C.I: 0.091

Margin of error for 95% C.I: 0.077

Step-by-step explanation:

In this question, for each student, there are only two possible outcomes. Either they use a pencil to take notes, or they do not. Students are independent of each other. So we use the binomial probability distribution to solve this question.

Binomial confidence interval:

In a sample with a number n of people surveyed with a probability of a success of \(\pi\), and a confidence level of \(1-\alpha\), we have the following confidence interval of proportions.

\(\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}\)

In which

z is the zscore that has a pvalue of \(1 - \frac{\alpha}{2}\).

The margin of error is:

\(M = z\sqrt{\frac{\pi(1-\pi)}{n}}\)

For this problem, we have that:

120 students, so \(n = 120\)

90 responded favorably, so \(p = \frac{90}{120} = 0.75\)

Margin of error for 90% CI:

Here \(\alpha = 0.1\), z is the value of Z that has a pvalue of \(1 - \frac{0.1}{2} = 0.95\), so \(Z = 1.645\).

The margin of error is:

\(M = z\sqrt{\frac{\pi(1-\pi)}{n}} = 1.645\sqrt{\frac{0.75*0.25}{120} = 0.065\)

Margin of error for 99% CI:

Here \(\alpha = 0.01\), z is the value of Z that has a pvalue of \(1 - \frac{0.01}{2} = 0.995\), so \(Z = 2.325\).

The margin of error is:

\(M = z\sqrt{\frac{\pi(1-\pi)}{n}} = 2.325\sqrt{\frac{0.75*0.25}{120} = 0.091\)

Margin of error for 95% CI:

Here \(\alpha = 0.05\), z is the value of Z that has a pvalue of \(1 - \frac{0.05}{2} = 0.975\), so \(Z = 1.96\).

The margin of error is:

\(M = z\sqrt{\frac{\pi(1-\pi)}{n}} = 1.96\sqrt{\frac{0.75*0.25}{120} = 0.077\)

Answer: Margin of error for 99% CI: z=2.575 . input that into the equation and it give you .1017

Step-by-step explanation:

Considering the definition of distance between two points, the distance between the points (-2,1) and (5,-4) is √74= 8.6023.

The distance between two points is equal to the length of the segment that joins them. Therefore, to determine the distance between two different points, you must calculate the squares of the differences between their coordinates and then find the root of the sum of said squares.

In other words, the distance between two points in space is the magnitude of the vector formed by said points.

So, given the coordinates of two distinct points (x1, y1) and (x2, y2), the distance between two points is the square root of the sum of the squares of the difference of the coordinates of the points:

distance= \(\sqrt{(x2-x1)^{2} +(y2-y1)^{2} }\)

In this case, you know:

Replacing in the definition of distance:

distance= \(\sqrt{(5-(-2))^{2} +(-4-1)^{2} }\)

distance= \(\sqrt{(5+2)^{2} +(-5)^{2} }\)

distance= \(\sqrt{7^{2} +(-5)^{2} }\)

distance= \(\sqrt{49+25 }\)

distance= √74= 8.6023

Finally, the distance between the points (-2,1) and (5,-4) is √74= 8.6023.

Learn more about distance between two points:

https://brainly.com/question/23848540

https://brainly.com/question/7243416

https://brainly.com/question/15973889

#SPJ1

Answer:

She will practice 2.5 for week four

Step-by-step explanation:

The table is going by 0.5 so I added 0.5 +2 =2.5

Answer:

hello

as probability is equal to number of favourable outcomes/total number of out comes,

Step-by-step explanation:

=7/10

HOPES THAT IT HELPS YOU

PLEASE MARK ME AS BRAINLIEST