For which values of x is the expression undefined?
9x – 36/x^2 + 7x – 18

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

Aflower has 26 chromosomes. to create a new flower, how many would a sperm cell have what is called?

Suppose that 15 inches of wire cost 60 cents. at the same rate, how much (in cents) will 12 inches of wire cost