Which statement is correct about the product of 9/10 and 7/8 ?

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

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

27/9=18/x a. x=9 b. x=18 c. x=6 d.x=3