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 9/a

Step-by-step explanation:

the denominators of all 3 fractions are same so the numerators can be simply added.

We get by adding (8-6+7)/a  = 9/a

9/a and x²/3

Step-by-step explanation:

add 8-6+7/a =9/a

7x²-3x²/12w = x²/3

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

54.864 meters

step-by-step explanation: