Answer:

Step-by-step explanation:
Given:
Rate of change of radius of cylinder:

(This is increasing rate so positive)
Rate of change of height of cylinder:

(This is decreasing rate so negative)
To find:
Rate of change of volume when r = 20 inches and h = 16 inches.
Solution:
First of all, let us have a look at the formula for Volume:

Differentiating it w.r.to 't':

Let us have a look at the formula:


Applying the two formula for the above differentiation:

Now, putting the values:

So, the answer is: 
Answer:
4 ounces per cup
Step-by-step explanation:
To find the unit rate, we take the ounces and divide by cups. We want a 1 in the denominator
3 ounces÷3/4 cup
Copy dot flip
3 ounces * 4/3 per cup
4 ounces per cup
Answer:
7
Step-by-step explanation:
Total concrete for slabs
24 * 24 * 1 = 576 ft³
Additional 20 %
By rule of three
if 576 ⇒ 100
x?? ⇒ 20 x = 115,2
And there are 2 slabs, the total volume of concrete is:
Q(t) = 2* (576 + 115,2 ) Q(t) = 1382,4 ft³ (1)
If the truck can carry a maximum of 8 yd³, as 1 ft³ = 0,037 yd³
then a truck can carry a maximum of
8/ 0,037 = 216,21 ft³
Now the total quantity is 1382,4
Then
1382,4/216,21 = 6,39
And as nobody can send a fraction of a truck , the fewest number of truck is 7
Is it number15?
then it is
3x = 180
x = 60
x will be 60
grand coulee dam (g) contains 2.5 times as much concrete as the hover dam (h)
Therefore,
g = 2.5 * h
h = 3.5 million
g = 2.5 * 3.5
g = 8.75 million yards of concrete