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#21054

functions

applications

hard

180 sec

A private tutor charges $80 for the first 2 hours of tutoring plus an hourly fee for each additional hour. The total cost for 5 hours of tutoring is $230. The total cost in dollars, for $x$ hours of tutoring, where $x \geq 2$ , can be modeled by a linear function $f (x) = a x + b$ . What is the value of $a$ ?

• 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.