A phone company charges a base fee of $12 per month plus an additional charge per minute. The monthly phone cost LaTeX: CC can be represented by this equation: LaTeX: C=12+a\cdot mC = 12 + a ⋅ m , where LaTeX: aa is the additional charge per minute, and LaTeX: mm is the number of minutes used. Which equation can be used to find the number of minutes a customer used if we know LaTeX: CC and LaTeX: aa? Group of answer choices

LaTeX: m=\frac{C}{a}-12 m = C a − 12

LaTeX: m=C-12a m = C − 12 a

LaTeX: m=\left(C-12\right)-a m = ( C − 12 ) − a

LaTeX: m=\frac{\left(C-12\right)}{a}