A window repair specialist charges $220 for the first two hours of repair plus an hourly fee for each additional hour. The total cost for 5 hours of repair is $400. Which function $\bm{f}$ gives the total cost, in dollars, for $\bm{x}$ hours of repair, where $\bm{x}\geq 2$?

MM

Mashaal Masha

Apr 12, 2024

A window repair specialist charges $\$220$ for the first two hours of repair plus an hourly fee for each additional hour. The total cost for 5 hours of repair is $\$400$. Which function $f$ gives the total cost, in dollars, for $x$ hours of repair, where $x\geq 2$?

Difficulty: Hard

A:

$f(x)=60x+100$

B:

$f(x)=60x+220$

C:

$f(x)=80x$

D:

$f(x)=80x+220$

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ID: 6619c352f516d0aa78a6047a