Frank runs 13 feet per second.
Jake runs 273 feet in 25 seconds.
Brooke runs 1 mile in 412 seconds.
Jessica runs 856 feet in 1 minute.

Estimate the area under the curve f(x) = 16 - x^2 from x = 0 to x = 3 by using three inscribed (under the curve) rectangles. answer to the nearest integer.