O GRAPHS AND FUNCTIONS Mary V E Finding outputs of a two-step... Try again... V Espanol Try Again Bob purchased a prepaid phone card for $20.00. Calls cost 9 cents a minute using this card. The credit, C (in dollars), left on the card after it is used for x minutes of calls is given by the following function. C(x) =20.00 - 0.09x How much credit is left on the card after Bob uses it for 50 minutes of calls? dollars X