Answer
$a)-1$
$b)7$
$c)19$
$d)112$
Work Step by Step
$a)f(-2)=3(-2)+5=-1$
$b)f(0)=4(0)+7=7$
$c)f(3)=4(3)+7=19$
$d)f(-100)+f(100)=[3(-100)+5]+[4(100)+7]$
$=[-300+5]+[400+7]$
$=[-295]+[407]$
$=112$
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