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Math·Algebra·Linear functions

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The cost of renting a power washer is $84 for the first day and $42 for each additional day.

Which of the following functions gives the cost $C(d)$, in dollars, of renting the power washer for $d$ days, where $d$ is a positive integer?

A

$C(d)=42d+42$

B

$C(d)=42d+84$

C

$C(d)=84d-42$

D

$C(d)=84d+126$