Question

Find f(3) for this piecewise-defined function.
f(x)=
–
1
3
x if x<5
4x–1 if 5≤x<15
–
7x+8 if x≥15

Answer 1

3 < 5, so use f(x) = -(1/3)x. Thus f(3) = -(1/3)*3 = -1.