Let us assume that the center of the circle is (0,0)
(x-h)² + (y-k)² = r²
x² + y² = 5,625
r² = 5,625
r = √5,625
r = 75
Area of a circle = π * r²
A = 3.14 * (75mi)²
A = 3.14 * 5,625 mi²
A = 17,662.50 mi²
It is written as 16-3 because it is 16 subtract 3 not 3 subtract 16 because that would come out to a negative integer.