Given:
f(x)=6x+10 Jimmy's production
g(x)=4x+15 Rick's production
therefore
h(x)=f(x)-g(x) Difference between Jimmy's & Rick's production
=(6x+10)-(4x+15) [do not forget the parentheses]
=6x+10 - 4x-15 [ do not forget to distribute the negative sign]
=6x-4x +10-15
=2x-5
=>
h(x) = 2x-5
