Answer
$g(f(0))=5$.
Work Step by Step
$f(x)=x^2+1$
$g(x)=2x+3$
$g(f(0))=g\left(0^2+1\right)=g(1)=2 \cdot 1+3=5$.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.