Question

A self-serve car wash charges $5.09 to use its facilities, plus an additional $0.60 for each minute the customer is at the self-serve car wash. If Tiffany was at the car wash for 9 minutes, how much was she charged?
A. $5.40
B. $10.49
C. $14.09
D. $5.69

Answer 1

We can create an equation to find the total cost of anyone who uses the car wash:

$\sf y=5.09+0.60x$

Where 'y' is total cost and 'x' is the minutes they spent washing the car. Plug in what we know:

$\sf y=5.09+0.60(9)$

Multiply:

$\sf y=5.09+5.40$

Add:

$\sf y=\boxed{\sf \ 10.49}$

So she was charged $10.49.