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#38089

applications

exponential

hard

90 sec

A plumbing service charges a flat fee plus an hourly rate for labor. For a job that took 2 hours, the total cost was $70. For a job that took 5 hours, the total cost was $145. If the total cost $C (h)$ can be modeled by a linear function of the number of hours $h$ , what is the flat fee, 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.