If a number has 20 as a factor, what other factors do you know that it must have​

How many sides does a regular polygon have if each exterior angle measures 72a.3b.4c.5d.6

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.

Out of 50 students surveyed, 16 have a dog. based on these results, predict how many of the 280 students in the school have a dog.