Question 767979
The goal is to learn to use function notation and apply definitions of functions and function notation.


Looking at the first task, (f-h)(4), seems to be just take the two functions, f and h, form their difference, and then evaluate this resulting function at x=4.


{{{f(x)-h(x)=2x+5-(7-x/3)}}}
={{{2x+5-7+x/3}}}
{{{2x-2+x/3}}}
{{{2*3x/3-2*3/3+x}}}
{{{(6x-6+x)/3}}}
{{{highlight((f-h)(x)=(7x-6)/3)}}}


At x=4, the function becomes
{{{(f-h)(4)=(7*4-6)/3=(28-6)/3=highlight(22/3)}}}