Agree with Elena. Noah is wrong. If it is 9x-(2x+4x) then it equals to 3x.
Answer:
b
Step-by-step explanation:

(3, -3/2)
Step-by-step explanation:
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Answer:
-162
Step-by-step explanation:
23=5-2/3d
2/3d=-18
d= -27
6d= 6* -27
6d= -162
Answer:
Step-by-step explanation:
area = ½×base×height
21 = ½(x+1)x
42 = (x+1)x
x² + x - 42 = 0
(x+7)(x-6) = 0
x = -7, 6
-7 is an extraneous solution, so x = 6