Work Step by Step
We know from the figure that there will be four sides of length $5$ and 8 sides of length $x$. Thus, writing this as a polynomial, we find: $$ 8x+(5)(4) \\ 8x+20$$
You can help us out by revising, improving and updating this answer.Update this answer
After 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.