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Math·Algebra·Linear functions

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The function $h$ is defined by $h(x)=8x+24$. The graph of $y=h(x)$ in the $xy$-plane has an $x$-intercept at $(a,0)$ and a $y$-intercept at $(0,b)$, where $a$ and $b$ are constants. What is the value of $a+b$?

A

21

B

18

C

24

D

27