A cup of coffee contains 140mg of caffeine. if caffeine leaves the body at 10% per hour ,how long will it take for half of the caffeine to be eliminated from ones body?

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

in simplified version   it would be x ≤-4

step-by-step explanation:

multiply each term in x ≤-4 by -1