Question

a phone company charges a base fee of $12 per month plus an additional charge per minute. the monthly cost c can be represented by the equation: $c = 12 + am$ where a is the additional charge per minute and m is the number of minutes used. which equation can be used to find the number of minutes a customer used if we know a and c? a. $m = c - 12a$ b. $m=\frac{c}{a}-12$ c. $m=(c - 12)-a$ d. $m=\frac{c - 12}{a}$ a. using the graph you sketched, pick a point on the line and explain wha it means in the context of the problem. point

Explanation:

Step1: Isolate the term with \(m\)

Given \(C = 12+am\), subtract \(12\) from both sides:
\(C - 12=am\)

Step2: Solve for \(m\)

Divide both sides of the equation \(C - 12 = am\) by \(a\) (assuming \(a
eq0\)):
\(m=\frac{C - 12}{a}\)

Answer:

D. \(m=\frac{C - 12}{a}\)