Please work out A and B and i will give the brainliest for both perimeter and area.

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

How do you use the elimination method for this question? explain, because i really want to understand!

Ineed i been stuck on this question since yesterday