Initial Knowledge Check Question 1 Lashonda purchased a prepaid phone card for $50.00. Calls cost 7 cents a minute using this card. The credit, C (in dollars), left on the card after it is used minutes of calls is given by the following. C- 50.00 - 0.07x How much credit is left on the card after Lashonda uses it for 20 minutes of calls? dollars X