Solve the system of equations.

13x−y=90

y=x2−x−42

enter your answers in the boxes.

and

Let f(x) = 3 − x . find the average rate of change of f(x) from x = a to x = a + h and simplify your answer so that no single factor of h is left in the denominator.

Prove that quadrilateral is a rhombus.

Including 6% sales tax, an inn charges $135.68 per night. find the inns nightly cost