exam Maths Puzzle Numerical Ability

simplify: 2a[5-a(2-3a)-2a]+3a^2

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exam Other Question

X Y
--- ---
0 -5
1 -4
2 -3
3 -2
4 -1
5 0
6 1

Demonstrate a problem showing similiar relationship to the problem above.
Table?
Graph? Find the slope of any line parallel to the line through points (15,1) and (4,2)

Please help, thank you
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