Write a Piecewise-Defined Function to Model the Monthly Cost C(x) $\$ 45.75$

Multiple Choice

Write a piecewise-defined function to model the monthly cost C(x) (in $) as a function of the number of minutes used x for the month.
-A cell phone plan charges $\$ 45.75$ per month, plus $\$ 9.55$ in taxes, plus $\$ 0.35$ per minute for calls beyond the 500 -min monthly limit.

A) $C ( x ) = \left\{ \begin{array} { l l } 55.3 , & \text { for } x \leq 500 \\ 55.3 + 0.35 ( x - 500 ) , & \text { for } x > 500 \end{array} \right.$

B) $C ( x ) = \left\{ \begin{array} { l l } 55.3 , & \text { for } x \leq 500 \\ 0.35 x , & \text { for } x > 500 \end{array} \right.$

C) $C ( x ) = \left\{ \begin{array} { l l } 55.3 , & \text { for } x \leq 500 \\ 55.3 + 0.35 x , & \text { for } x > 500 \end{array} \right.$

D) $C ( x ) = \left\{ \begin{array} { l l } 55.3 , & \text { for } x \leq 500 \\ 0.35 ( x - 500 ) , & \text { for } x > 500 \end{array} \right.$