write the inequality

Question

a cell phone company  advertises cut-rate phone service for $9.00 a month plus a $0.45 per call. if your budget allows you to spend at most $15.00 on phone service a month, what is the maximum number of calls you can make/ I know the answer is 13 calls . I need you to write the equation

Answer 1

($0.45 per call)*(Number of Calls) + $9.00 = Monthly Cost

 

Let x = the Number of Calls:

 

(0.45)x + 9 = Monthly Cost

 

We want your Monthly Cost to be less than or equal to $15.  So:

 

(0.45)x + 9 ≤ 15

 

Solve for x.