Question

The expression c=30m + 400, models the total cost (c) to buy a wireless

phone with a data plan for (m) months. Which of the following is not a true statement
about this situation?
1) The phone costs $400.
2) If you spent a total of $1,200, you had the phone for 20 months.
3) If you have the plan for a year, you have paid $760,
4) The data plan costs $30 per month.

Answer 1

2) If you spent a total of $1,200, you had the phone for 20 months.

Explanation:

From the equation, the cost of the phone is 400 and the monthly data plan costs $30 per month

For 20 months, you would have paid:
30 x20 + 400 = 600 + 400 = $1000

and not $1200

So statement 2 is false