ur inbox is full so have to post here. lol idk but for some reason my AMC answers disagree with yours for Q5, Q10 and Q18 so far (im only up to Q18)
For Q5, i think E is incorrect because if you sub in b=4, then p=42, which is divisible by 7. My answer was B for that one.
For Q 10, i think B is incorrect because 10 can be made by these 5 steps:
0+1=1, 1x2=2, 2x2=4, 4+1=5, 5x2=10
My answer was A for that one.
For Q18, I found 7 different ordered pairs, so my answer is D, not B.
the ordered pairs i got were (12,17), (12,7), (5,17), (5, -7), (0,13), (13,13), (0,-13). it tells you x is greater than or equal to 0 but not necessarily y.
these are just my thoughts, and i may well be wrong. anyways good luck for your trials!