Answer:
50(x) and 10+35(x)
Step-by-step explanation:
Because ypu are multiplying 50 by however many hours and then you are adding 10 to 35 foreveryhour
f(4) = 3×4^2+15
4^2=16
3×16
48+15
63
f(4)=63
Y=x+12
Not pretty sure XD but .-.