Can someone pls help me I’m stuck

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

You earn a 12% commission for every car you sell. how much is your commission if you sell a $23,000 car?

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b