Math please help people

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

What is coefficient of the term of degree of degree 5 in the polynomial below

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.