Can someone please solve this using quadratic formula
2x^2 -7x -15=0

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.

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.

What is the equivalent fraction for the following fraction using 5 as the multiplier? 1/2