Question

nadia’s cell phone plan charges a flat rate of $20 per month plus $0.15/minute for each minute. which of the following equations represents the total cost (c) based on the number of minutes used (m).
○ c=20m+0.15
○ m=20+0.15c
○ c=0.15m+20
○ m=20c+0.15

Explanation:

Step1: Identify cost components

Flat rate: $20 (fixed), per - minute cost: $0.15 per minute (variable, depends on M). Total cost \( C = \) fixed cost + variable cost. Variable cost is \( 0.15\times M \), fixed cost is 20.

Step2: Formulate the equation

So \( C=0.15M + 20 \).

Answer:

\( C = 0.15M+20 \) (the option with this equation)