Answer:
Tiffany was charged $8.36
Explanation:
From the question, we can create the following equation where "c" is the amount of money she was charged, and "m" is the number of minutes Tiffany is in the car wash...
c = 0.51m + 5.81
Since in our case "m" equals 5, then...
c = 0.51m + 5.81
c = 0.51(5) + 5.81
c = 2.55 + 5.81
c = 8.36
Therefore Tiffany was charged $8.36