1: x = x: 81 what number can replace x?

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

What is the size of the matrix resulting from

Compare the cost of the bike trips from the two companies shown. for both the cost in a linear function of the number of days which statements is true