answer:
[tex]3\\[/tex]
explanation:
[tex]\frac{f(x+h)+f(x)}{h}[/tex]
[tex]\hookedrightarrow given.that .f(x) = 3x +h[/tex]
solve:
[tex]\frac{3\left(x+h\right)+5-\left(3x+5\right)}{h}[/tex]
[tex]\frac{3x+3h+5-3x-5}{h}[/tex]
[tex]\frac{3h}{h}[/tex]
[tex]3\\[/tex]
