4less than the quotient of a number x and 5

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.

What is the the greatest common factor ?

If a suspect is in possession of 20 grams of cocaine how many ounces does he possess what will the charge be