14. If g(x)=2.5x + 7, then g(6)=___?

15. If f(x)=-6x-3, then f(2)=___?

16.if g(3)=12, then g(x)=2x+___?

17. If f(x)=25-2x, then f(5)=___?

14 If gx25x 7 then g6 15 If fx6x3 then f2 16if g312 then gx2x 17 If fx252x then f5 class=