The correct answer is d. 75.
To find this we need to use the area of a circle formula for both targets. The area formula is below.
A = pi*r^2
First we find the area for the bigger target
A = pi*7^2
A = 49*pi
Then we find it for the smaller target
A = pi*5^2
A = 25*pi
Now we subtract the smaller from the larger.
49*pi - 25*pi = 24*pi or about 75
