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#21004

linear equations

word problems

medium

90 sec

A plumber charges a flat fee for a service call in addition to an hourly rate. The relationship between the total cost, $C$ , in dollars, and the number of hours the plumber works, $h$ , is represented by the equation $C - 45 h = 75$ . If the plumber charges a flat fee in addition to an hourly rate, what is the amount, in dollars, of the flat fee?

• 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.