## Question 653:

1## Answer:

No answer provided yet.We'd need to use some algebra and substitue the value of 20 minutes. To do so, the equation becomes : Cost = 0.50 + 0.15 (20). We multiply .15 * 20 and add .50. This gets us the value Cost = 3.5. If we are to assume this value is in dollars, the cost of a 20 minute call is $3.50.