book Maths Puzzle Numerical Ability

I believe this is linear algebra.

Two rivers running from south to north,

Is this well defined or not well defined?

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book Other Question

Factor each of the following.
1) a2-9
2) 4a2-4a+1
3) y2+16y+64
4) 81r2 -36rs +4s2
5) x2 +3x+2
6) x2+8x+12
7) 72 - 22x+x2
8) x2 +x-6
9) x2-5x-24
10) 3x2+11x+10 Find 3 consecutive odd integers such that the smallest is 10 more than the sum of the other two integers.