Can anyone solve for the missing side length ?

Which expression is equivalent to 2x^2+7x+4?

Angela rode his bike around a bike trail that was 1/4 of a mile long he rode his bike around the trail 8 * angelo says he wrote a total of 8/4 miles to russell says he's wrong and he actually and says that he actually wrote to my who is corrupt use words and trying to explain how you know.

Sum of the interior angles of a pentagon