The cost of a phone plan Q is $10 per month plus $0.14 per minute. Phone plan R cost $7 per month plus $0.17 per minute. If Anthony talks on the phone for 70 minutes in a month, which plan is less expensive for Anthony, and by how much?

Plan Q cost $18.9 and it is less expensive by $0.9

Step-by-step explanation:

Cost of Phone Q=$10+$0.14 per minute

Cost of phone R=$7+$0.17 per minute

Let m=number of minutes

If Anthony talks for 70 minutes

Cost of Q=$10+$0.14 (m)

=$10+$0.14 (70)

=$10+$9.8

=$19.8

Cost of phone R=$7+$0.17 (m)

=$7+$0.17 (70)

=$7+$11.9

=$18.9

Plan Q cost $18.9 and it is less expensive by $0.9