David found that 25 out of 100 people sleep less that 8 hours a day. Create a 99% confidence interval for the proportion of people who sleep less than 8 hours a day.

Pyotr tchaikovsky sporting goods operates on a 45% overhead based on the selling price, which results in an overhead of $65.34 on the newest version of an air hockey game set. if the air hockey game set costs pyotr tchaikovsky sports $49.32, find the selling price, the markup, and the net profit.

The radius of a sphere is 3 inches. which represents the volume of the sphere?

Sara made $253 for 11 hours of work. at the same rate how much would he make for 7 hours of work?