I need help how do i figure out these steps im not supposed to be in algebra

Replace the x in f(x) with the corresponding number!

f(3)= 3(3)-1

the answer to that one would be 8

f(2)= 3(2)-1

the answer would be 5

Answer d; a supplementary angle = 180°, so if that angle = 150°, y would = 30°.