A) x=1,-13
B) x= -1 +- square root of 21 dvided by 10
C) x= 3 +- i square root of 7 divided by 2
D) x= 1 +- i square root of 11 divided by 4
are your O's different sizes? or is it just my eyes?
8 because when you flip one coin there is 2 outcomes: heads and tails. Therefore if you flip 3 of them it is 2*2*2=8
