7A. 45+10=55
So 55 is in all of them whole integer and rational numbers
8A. Is no yes yes
B.a
9.A >
10.a
D is the correct answer partly because it's the only equation that has the correct outcome and partly because you have to divide 1313 by 4 anyways for the answer to make sense.
number of cups you have ÷ number of cups per serving = number of servings
After 4 months! You do 120-20=100 which indicates only the month prices, then 100 divided by 25 which is 4!
-27y^4 (^=exponent) so -27y to the fourth power. Hope this helps!