You don't have to look very far in either case. Both answers are "a".
1. Checking selection "a",
265 =? 35 +20*7 = 35 +140 = 175
a (7, 265) is NOT a solution
2. Checking selection "a",
18 =? 5*4 -2 = 20 -2 = 18
a (4, 18) IS a solution
B. Quadrant 3
The top left corner is quadrant 1 then the top right corner is quadrant 2 then the bottom right corner is quad 3