Question

Lampard has a phone plan that costs a monthly rate of $50forthefirst1,000minutesplus$0.25 for each additional minute. Determine the appropriate function which models Lampard's plan for all m > 1,000, with m as the number of minutes per month and f(m) as the monthly charge.

• A. f(m) = 0.25m
• B. f(m) = 0.25m + 50
• C. f(m) = 0.25m-200
• D. f(m) = 0.25m-950

Answer 1

The correct option is C f(m) = 0.25m-200

According to the plan the cost of first 1000 minutes is $50

if the m>1000 then $0.25 for additional minutes

As m is the number of minutes per month and m>1000 so

$f\left(m\right)=.25(m-1000)+50$

$f\left(m\right)=.25m-250+50$

$f\left(m\right)=.25m-200$