PLEASE HELP MEE :)

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

Aclothing designer is selecting models to walk the runway for her fashion show. the clothes she designed require each model’s height to be no more than y inches from 5 feet 10 inches, or 70 inches. which graph could be used to determine the possible variance levels that would result in an acceptable height, x?

During how many months was the difference between the number of days with homework and with no homework greater than 6?