tolong dibantu ya untuk tugas besok

a. f(x) = 4x - 8
b.
f(-5) = 4(-5) - 8 = -20 - 8 = -28
f(4) = 4(4) - 8 = 16 - 8 = 8

f(-5)  + f(4) = -28 + 8 = -20
c.
f(p) = 4p - 8
16 = 4p - 8
4p = 16 + 8
4p = 24
p = 24 / 4
p = 6