Question

Find f(15) for this piecewise-defined function.
f(x)=
7x+3 if x≤0
6x+3 if 0<x<10
–
x+11 if x≥10

Answer 1

Since 15 ≥ 10, use the third piece f(x) = −x + 11. So f(15) = −15 + 11 = −4.