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Math·Algebra·Linear functions

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h	f(h)
1	140
2	225

The table gives the number of hours, $h$, of labor and a plumber’s total charge $f(h)$ dollars, for two different jobs. There is a linear relationship between $h$ and $f(h)$. Which equation represents this relationship?

A

$f(h)=85h+55$

B

$f(h)=55h$

C

$f(h)=110h+30$

D

$f(h)=30h+110$