Answer
$a) 3$
$b) 8$
$c) -5$
$d) 2a+3$
$e) a+5$
Work Step by Step
$a) f(0)=0+3=3$
$b) f(5)=5+3=8$
$c) f(-8)=-8+3=-5$
$d) f(2a)=2a+3$
$e) f(a+2)=(a+2)+3=a+5$
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