Which point is the imagine of P

What is the rescursive formula for this geometric sequence? 7, -14, 28, -56

An advertising firm has an old computer that can prepare a whole mailing in 6 hours. with the of newer model the job is complete in 2 hours. how long would it take the newer model to do the job alone?

Eden has a part time job. she is paid ? 7.20 an hour the week she worked 18 and a half hours how much is she paid