Answer:
I dont know im really sorry
A. 3x^2+7x^2+2×3x ×7-84x = 3x^2+7x^2-2×3x×7
9x^2+49x^2+42x-84 x= 9x^2+49x^2-42x
9x^2+49x^2-42 = 9x^2+49 x^2-42x
verified
B.
neither terminating nor repeating.
Step-by-step explanation:
20%
660:3300*100 =
(660*100):3300 =
66000:3300 = 20