Answer:
The rate of change of the area of the circle is approximately
.
Step-by-step explanation:
Given:

radius 
We need to find the rate of change of the area of the circle at that instant.
Solution:
Now we know that;
Area of the circle is given by π times square of the radius.
framing in equation form we get;

to find the rate of change of the area of the circle at that instant we need to take the derivative on both side.

Substituting the given values we get;

Hence The rate of change of the area of the circle is approximately
.
Answer:
Step-by-step explanation:
300-124= 176
176/13 = $13.50 per week
Answer:
i will buy wo different with good price
Step-by-step explanation:
No, they'd need 13 1/2 quarts of grain. 2 1/4 x 2 for 2 horses = 4 1/2
4 1/2 x 3 for 3 days = 13 1/2