Help me with this question, please.

I will do one of them and explain so you can do the rest

an 80% increase followed by a 40% decrease.

since the increase is greater than the decrease (80>40) it would go into the greater than original group since it has been increased.

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

c. (3,2,6) is the answer.