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(a) Lily: 5 * 2 - 12 + 3 = 1 pt

(b) Rose: -3 * 2 -1 + 6 + 7 = 6 pts

(c) Rose

step-by-step explanation: h: (- 3, 6)

m: (1, - 2)

o: (7, 6)

r: (- 9, - 2)

midpoint of hm: (- 1, 2)

midpoint of or: (- 1, 2)

therefore, b is the midpoint of both diagonals bisect each other !

to prove the diagonals are perpendicular, show that the product of the slopes = - 1

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