Respuesta :
Answer:
The answer to your question is: C = 0.79a + 1.89r
Step-by-step explanation:
Data
Cost = C
apps = $0.79 = a
ringtones = $1.89 = r
C = 0.79a + 1.89r
Answer: that answeer is wrong ^^^^^ its asking fro an expression
Step-by-step explanation: