Prove that the set of points A(3,3),B(1,-2),C(-5,-2) and D(-3,3) be the vertices of parallelogram

You are constructing a histogram for scores that range from 70 to 100 in whole points. frequencies range from 3 to 10; that is, every whole-point score between 60 and 100 occurs at least 3 times, and at least one score occurs 10 times. which of these would probably be the best range and size for the score intervals along the x-axis?

If a baby uses 15 diapers in 2 days, how many diapers will the baby use in a year?

What is the rate of change of a line that passes through (2,-5) and (6,-2)?