Question

Cathy pays $25 a month plus $0.05 per text message. She models this with the function C = 0.05x + 25. If the text messaging fee increases to $0.10, what is her new function?
A) C = 10x + 25
B) C = 0.10x + 25
C) C = 0.10x + 0.05
D) C = 0.05x + 0.10

Answer 1

I think the answer is b) C=.10x+25

Answer 2

Answer: B. C = .10x + 25

Step-by-step explanation: If the original equation uses .05, and that equation is .05x + 25 = C, then increasing it to .10 would mean that the new equation is .10x + 25.