Idon't know how to do this what's the answer? ?

Adozen bananas weigh 3 pounds how many ounces does 1 banana weigh

Convert the mixed numbers into improper fractions. convert the improper fraction to mixed numbers.

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.