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#36052

linear equations

money

functions

medium

75 sec

A car rental company charges a flat fee plus a per-mile rate. The total cost $C (d)$ , in dollars, for driving $d$ miles is given by the function $C (d) = R d + F$ , where $R$ is the per-mile rate and $F$ is the flat fee. If the flat fee is $40 and the total cost to drive 100 miles is $90, what is the per-mile rate, in dollars?

• Up to 5 characters (6 if negative). Only numbers, decimal (.), fraction (/), negative (-).
• Fractions must be in lowest terms.
• Mixed numbers must be converted to improper fractions.