The tennis team is creating one doubles team to play at its matches. there are 13 people on the tennis team. how many different ways can the two people on the doubles team be chosen?

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

X+ 4y − z = −14 5x + 6y + 3z = 4 −2x + 7y + 2z = −17

Given: df and de are midsegments of abc prove: de=1/2 ac