Problema Solution
Write a function rule to model the cost per month of a long- distance cell phone calling plan. Then evaluate the function for the given number of minutes.
25. Monthly service fee: $4.52 Rate: $.12 per minute Minutes used: 250
26. Monthly service fee: $3.12 Rate: $.18 per minute Minutes used: 175
Answer provided by our tutors
The function is
long- distance cell phone calling fee = Monthly service fee + Rate*Minutes used
25）
long- distance cell phone calling fee = $4.52 + $0.12*250 = $34.52
26)
long- distance cell phone calling fee = $3.12 + $0.18*175 = $34.62