How do you add (−3c 4 −5c 2 −7c)+(4c 4 +8c 3 +2c 2 )

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

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

Which polygon is she in the process of constructing ?