$570.60 because 90/100=.90 so multiply that with 634 with .90 you get 570.60
The answer is -6 if u suntract the numbers you can see.
I'd say A. 8000, because you'd get the most answers and the biggest variety in answers for a more accurate sample.
positive number times negative number is negative number "(+)(-) = (-)".

we change the mixed numbers to the improper fractions

F - 12 = -35
f - 12 + 12 = -35 + 12
f = -23