How do i do this i don't know how to do it

Which statement explains how you could use coordinate geometry to prove that quadrilateral abcd is a parallelogram? -5 -4 -3 -2 -1 t 1 2 3 4 prove that all sides are congruent and have slopes that are opposite reciprocals prove that segments ad and ab are congruent and parallel prove that opposite sides are congruent and have equal slopes prove that segments bc and cd are congruent and parallel

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?