Ive tried looking for a similar question on the forums but I couldnt find any. I would greatly appreciate any help given! enter image description here
There is something called chain rule. In your case $f(x)=g(h(x))$. So $f'(x)=g'(h(x))\cdot h'(x)$.
Therefore $f'(3)=g'(h(1))h'(1)=g(3)\times (-0.5)=2\times(-0.5)=-1$. Do the other one yourself.