Find the derivative of f(x) = X at x = -2.

70686 sq.ft.

Step-by-step explanation:

Given : Radius of the whole space is 250 ft.

            Radius of pond is 200 ft.

To Find: the square feet of gravel needed

Solution:

Area of whole space =

                                  =

                                  =

Area of Pond =

                                  =

                                  =

So, the square feet of gravel needed =

                                                              =

Hence 70650 sq.ft. of gravel is needed.

So, Option D is approximately equal to the obtained answer

So, Option D is true.