Integers whose sum is 5 and product is -66

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Which of the following statements would be sufficient to prove that parallelograms pqrs is a rectangle ?

Fill in the blank 1. a rhombus is a rectangle a) always b) sometimes c) never 2. a square is a quadrilateral a) always b) sometimes c) never 3. a trapezoid is a kite a) always b) sometimes c) never 4. a quadrilateral is a kite a) always b) sometimes c) never 5. a square is a rhombus a) always b) sometimes c) never 6. a parallelogram is a rectangle a) always b) sometimes c) never