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I NEED HELP QUICK, PLEASE!

A hair salon charges a fixed rate of $25.00 for a haircut and then an additional $15 for any other services. Write a function to model the cost of services there and then determine how many services you had if you were charged $115

A) f(x) = 15x + 25; f(6) = 115
B) f(x) = 25x + 15; f(6) = 165
C) f(x) = 15x + 25; f(6) = 125
D) f(x) = 15x + 25; f(115) = 1750

Respuesta :

miagwh
The answer is A
1. Let x = # of services
2. f(x) = 15x + 25 
3. Set f(x) to 115 and solve for x:
f(x) = 15x + 25
115 = 15x + 25
90 = 15x
6 = x
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A) f(x) = 15x + 25; f(6) = 115