I don’t understand this problem

Answer:

7536 [tex]km^3/sec[/tex]

Step-by-step explanation:

Given that:

Rate of decreasing of radius = 12 km/sec

Height of cylinder is fixed at = 2.5 km

Radius of cylinder = 40 km

To find:

The rate of change of Volume of the cylinder?

Solution:

First of all, let us have a look at the formula for volume of a cylinder.

[tex]Volume = \pi r^2h[/tex]

Where [tex]r[/tex] is the radius and

[tex]h[/tex] is the height of cylinder.

As per question statement:

[tex]r[/tex] = 40 km (variable)

[tex]h[/tex] = 2.5 (constant)

[tex]\dfrac{dV}{dt} = \dfrac{d}{dt}\pi r^2h[/tex]

As [tex]\pi, h[/tex] are constant:

[tex]\dfrac{dV}{dt} = \pi h\dfrac{d}{dt} r^2\\\Rightarrow \dfrac{dV}{dt} = \pi h\times 2 r\dfrac{dr}{dt} \\$Putting the values:$\\\Rigghtarrow\dfrac{dV}{dt} = 3.14 \times 2.5\times 2 \times 40\times 12 \\\Rigghtarrow\dfrac{dV}{dt} = 7536\ km^3/sec[/tex]

Given that,

The equations : 2f-5g=-9  and -7f+3g=4

To find,

The solution of the above equations.

Solution,

We have,

2f-5g=-9  ....(1)

-7f+3g=4 ......(2)

Multiply equation (1) by 7 and equation (2) by 2.

14f-35g=-63  ....(3)

-14f+6g=8 ......(4)

Add equation (3) and (4)

14f-35g -14f+6g = -63 + 8

-29g = -55

g = 55/29

g = 1.89

Put the value of g in equation (1).

2f-5(1.89)=-9

2f = -9+5(1.89)

f = 0.225

Hence, the solution of the above equations are g = 1.89 and f = 0.225.

Answer:

A

Step-by-step explanation:

edg 2021

Answer: 250 $3 tickets and 100 $2 tickets were sold.

Answer:

The answer is X

Step-by-step explanation:

Sike, I aint finna help you. What you thoguht this was? A cheating website, get yo lil ah off this shi

Answer:

girls are always better and with be better than boys ;)

Step-by-step explanation:

Answer:

okkk

Step-by-step explanation:

Answer:

1 triangle is the right anwer

Complete question :

Jeremiah plans on building a 5 meter long garden walkway that is paved with square stones that measure " 5/6 meter on each side. There will be no spaces between the stones. How many stones will be needed to complete the garden walkway?

Answer:

12

Step-by-step explanation:

Given that:

Length of square block to be used = 5/6 meters

Length of garden. Walkway = 5 m

Since length of walkway is the same on both sides, then the Total length = 5m + 5m = 10 meters

Number of square stones required :

Total length of walkway / side length of stones to be used

= 10 meters ÷ (5/6) meters

= 10 * 6/5

= 60 / 5

= 12 stones

Answer:

A'={5,0}

B'={2,0}

C'={2,4}

Step-by-step explanation:

The coordinates of the object triangle are;

A = {-3,0}

B= {0,4}

C={0,0}

The reflection is on line x=1

See attached graph with the image for the coordinates of the triangle after reflection

A'={5,0}

B'={2,0}

C'={2,4}

Answer:

0

Step-by-step explanation:

say that you have 0 bottles of ketchup and you get 0 more bottles of ketchup every hour you work. not only does it make no sense but if you work zero hours you will end up with 0 ketchup bottles

Answer:

7

Step-by-step explanation:

115/17=6.7..... Round up to 7.

7 boxes should be the answer

Answer: 25% markup

Step-by-step explanation:

Answer: I got 42

Step-by-step explanation:

(using I's as an example)

There started with 2 boxes

Then there are 4 boxes in each in those two

Now each of those boxes have 4 in them.

Answer:

[tex]y= x - 300[/tex]

[tex]y = -246[/tex] -- Her equivalent weight on earth

Step-by-step explanation:

Given

The attached table

Required

Fill in the gaps

(a) The equation

First, we calculate the slope (m)

[tex]m = \frac{y_2 - y_1}{x_2 - x_1}[/tex]

From the table, we can say that:

[tex](x_1,y_1) = (0,-300)[/tex]

[tex](x_2,y_2) = (300,0)[/tex]

So, we have:

[tex]m = \frac{0 -(-300)}{300 - 0}[/tex]

[tex]m = \frac{0 +300}{300}[/tex]

[tex]m = \frac{300}{300}[/tex]

[tex]m = 1[/tex]

The equation is then calculated using:

[tex]y - y_1 = m(x - x_1)[/tex]

This gives:

[tex]y - (-300) = 1(x - 0)[/tex]

[tex]y +300 = 1(x)[/tex]

[tex]y +300 = x[/tex]

[tex]y= x - 300[/tex]

(b) When x = 54

Substitute 54 for x in [tex]y= x - 300[/tex]

[tex]y = 54 - 300[/tex]

[tex]y = -246[/tex]

Answer: x=4

Step-by-step explanation:

Simplify the left side of 9x-3x-5=19 by combining like terms:

6x-5=19

Add 5 to both sides:

(6x-5)+5=19+5

Simplify:

6x=24

Divide both sides by 6:

(6x)/6=24/6

Simplify:

x=4

Answer:

Sharon is 36

Her daughter is 7 years and 2 months

Step-by-step explanation:

sharon is 5× as old

her daughter is written as 1 (because we dont know about her age)

then square root of 256 to find square which is equal as said in the queston:which is 16

algebraic equation would be:5n+16 (n represents the years and 5 is how many times older sharon is and 16 is how old their square sum of agewas 4 years ago)

Their present age would be:

Sharon=5x4+16=36

Daughter =36÷5=7 years 2 months

The present age of Sharon is 20 and the Present age of her daughter is 4.

A mathematical statement in which two expressions are rendered equal to one another is known as an algebraic equation. A variable, coefficients, and constants make up an algebraic equation in most cases.

Given, Sharon is five times her daughter's age. The square of their ages was equal to 256 four years ago. Let the age of Sharon is x and the age of her daughter be y.

Thus the algebraic equation formed as per the given data is,

x = 5*y (Present age)

(x-4 + y -4)^2 = 256 (Four years ago)

Taking square root both the sides

x + y = 24

comparing both equations

5 y + y = 24

y = 4

and x = 20

Therefore, Sharon is currently twenty years old, and her daughter is currently four years old.

Learn more about algebraic equations here:

https://brainly.com/question/29131718

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Answer:

Step-by-step explanation:

89

Answer:

4x+7=23

4.4+7=23

Step-by-step explanation:

23-7=16

16/4=4

The algebra tiles used in the equation 4x + 7 = 23 are four x-tiles, seven unit tiles, and 23 unit tiles.

To model the equation 4x + 7 = 23 using algebra tiles, we would use variable tiles (x-tiles) and unit tiles.

For the term 4x, we would use four x-tiles since the coefficient is 4.

For the term 7, we would use seven unit tiles since it is a constant.

The equal sign (=) does not have a specific tile representation; it simply indicates the equation's balance.

On the other side of the equation, for the term 23, we would represent it using 23 unit tiles.

So, the algebra tiles used in this equation would be four x-tiles, seven unit tiles, and 23 unit tiles.

To know more about algebra, refer here:

https://brainly.com/question/31274000

#SPJ6

Answer:

eab

Step-by-step explanation:

Answer:

   0.0327  there i helped -_-

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Answer:

3x+20y

Step-by-step explanation:

First write down the expression.

5(x + 5y) - {2x – [3x – 3(x – 2y) + y]}

Now, the first thing you would have to do is the first parenthesis

5(x+5y)

5x+25y

So far, the expression looks like this: 5x+25y - {2x – [3x – 3(x – 2y) + y]}

No we would do the smallest parenthesis in the expression.

Which is: (x – 2y)

But since there is nothing to simplify, we move on

Next one is  [3x – 3(x – 2y) + y]

We have to do 3(x-2y) first

This is equal to: 3x-6y

So far, the expression looks like this:5x+25y - {2x – [3x – 3x-6y + y]}

The next step is still in the other parenthesis up top

Which is: [3x – 3x-6y + y]

We have to add up the x's and y's

Which is -5y

Our expression now looks like this:5x+25y - 2x-5y

Since we don't have anymore parenthesis, we look for the same letter and add or subtract them.

We have to do 5x-2x=3x

25y-5y=20y

So that means our final answer is :3x+20y

Hope this answer is correct!

If It is, can you give me brainliest, it took me almost 25 minutes to write this down.

Answer:

Pole^2 = 221^2 - 21^2

Pole^2 = 48,841 -441

Pole^2 = 48,400

Pole = 220 cm

Answer is B

Step-by-step explanation:

Answer:

3 terms.

Step-by-step explanation:

A term is a single mathematical expression. It may be a single number (positive or negative), a single variable (a letter), or several variables multiplied but never added or subtracted. That means V is a term, 9t is a term, and u is a term.

Answer:

The last one. The table with 12 sections and 2 letters in each one.

Explanation: For every flip (12 total flips) there were 2 coins. So there are 12 sections in the table (the amount of times the coins were flipped) and 2 letters for each one (representing that 2 coins were flipped at the same time).

Hope this helps <3333

Answer:

20.1168

Step-by-step explanation:

#carryonlearning

#carryonlearning

#carryonlearning

Answer:

3.9

Step-by-step explanation:

bshwhsbwjwwjusushs

Step-by-step explanation:

The y-intercept is the value where the line crosses the y-axis.

y-intercept of Line 1 (blue) = 4.

y-intercept of Line 2 (red) = 1.

Answer:

C: square root 0.31 (0.69)/100 + 0.27(0.73) /100

Step-by-step explanation:

that's the answer I'm just to lazy to put the explanation but yeah, that's the answer

Answer:

A positive relationship between the inputs and the outputs is one wherein more of one input leads to more of an output. This is also known as a direct relationship. On the other hand a negative relationship is one where more of one input leads to less of another output.

Step-by-step explanation:

Hope this helps

y = 2x + 4

Step-by-step explanation:

Answer:

Not 100% sure if this is right but i think it would be y=2x + 4

Step-by-step explanation:

Answer:

Answer would be B.

Step-by-step explanation:

there are two dors located at x= -4 and x=9