find the constant of variation k for the inverse variation. then write an equation for the inverse variation. y=4.5 when x=3

Nell has a sales clerk job that pays $12 per hour for regular gas work hours. she gets double time for any hours over 40 that she works in a week. how many hours did nell work if her weekly pay was $744

Bernice paid $162 in interest on a loan of $1800 borrowed at 6%. how long did it take her to pay the loan off?

What is the product? a-3/15a × 5/a-3