The population of Chicago, IL, is about `93,495` people. Ten years ago, the population was about `75,400` people.

By what percent did the population increase between ten years ago and now?

The number of nails of a given length is normally distributed with a mean length of 5.00 in, and a standard deviation of 0.03 in. find the number of nails in a bag of 120 that are less than 4.94 in. long.

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

Write an algebraic expression to match each statement a. four less than 8 times a number b. twice the difference of a number and six c. nine from a number squared