binks need to raise at least $3600. He was given $200 and plans to save $50 per

First of read all formulas

Step-by-step explanation:

Calculate 50 *7 and add 350 and 200

2461.76

Step-by-step explanation:

A=πr^2

First, find the area of the smaller circle.

A = (3.14)(21^2)

A = 1384.74

Next, find the area of the larger circle. Since it was stated that both circles have the same center, the radius would be 28.

A = (3.14)(28^2)

A = 2461.76

Now subtract the area of the smaller circle from the larger circle.

2461.76 - 1384.74 = 1077.02

Since 1077.02 is already rounded to the nearest hundredth, leave it as it is.