Am I supposed to do 360-128??? Help pls

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?

1. what is the measure of ∠abc? what is the measure of ∠abd?

Write the rational number in lowest terms 99/-15