Replace the question mark (?) with to make the equation true. (m-n)/(m^(2)-n^(2))(?)/((m-1)(m-n)) =(2m)/(m^(2)-n^(2))

Answers
A) m+n
B) 0
C) m-1
D) -(m+n)

Find a number such that if you add 8 and divide the result by 4 you will get the same answer as if you subtracted 3 from the original number and divided by 2

Does the point (1, sqrt 7) lie on circle shown.

Money off coupons have been circulated to 300 households. only 2/5 of these were redeemed (used) in the local supermarket to get a free shampoo. what fraction of coupons were unused? (ps: write how you got the answer)