C equals 51 m + 4.4 where C is the cumulative cell phone cost and m is the number of months. Using the data which value is the best prediction of the cumulative cell phone cost after 18 months

Answer 1

To find the cumulative cell phone cost \( C \) after 18 months using the equation \( C = 51m + 4.4 \), where \( m \) is the number of months, we can substitute \( m \) with 18.

\[ C = 51(18) + 4.4 \]

Calculating it step-by-step:

1. Calculate \( 51 \times 18 \): \[ 51 \times 18 = 918 \]

2. Now add 4.4 to the result: \[ C = 918 + 4.4 = 922.4 \]

So, the best prediction of the cumulative cell phone cost after 18 months is $922.40.