The answer is a because it starts at 0 then goes up to 23 and then it goes up to 46.
The difference will be

.
Remember that parentheses are needed for the second polynomial because the negative is distributed to all of its terms.
9 = -7-2y
9 +7=16
16/-2 -2y/-2
-8 = y
Click off the first one because 180 (Thea) < 225 (Eleanor). Then keep the second one and click the third and fourth one.