Mal rented a truck for one day. There was a base fee of $8.25,and there was an additional charge of 25 cents for each cents for each mile driven. The total cost C (in dollar), for driving x miles is given by the following:
C 0.25x + 8.25
What is the total rental cost if Mai drove 50 miles?

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.