Exact value of the function for the given x-value f(x) = 5x for x = -1

-5, because when plugging the -1 in for x then multiplying it by 5, you get -5

Use pythagorean’s theorem and find the missing side lengths of the two smaller triangles and add them together
13^2 - 12^2 = 5
15^2 - 12^2 = 9
5+9 = 14
14 is the length of each side of the square
14^2 + 14^2 = 19.8
19.8 is the diagonal length of the inside if the square