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

question 292

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

---

Definitions:

Posterior Chamber

The fluid-filled space between the iris and the lens of the eye, containing aqueous humor.

Iris

The iris is the colored part of the eye that controls the size of the pupil and the amount of light reaching the retina.

Lens

A transparent structure in the eye that focuses light rays onto the retina to create clear images.

Retina

A layer of tissue at the back of the eye that senses light and sends visual signals to the brain.