exam Maths Puzzle Numerical Ability

Solve absolute value equation and graph the solution set.

2x-8=0

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exam Other Question

missing no....1,3,7.15_____,_______ 1 3 0 1 0
2 -1 4 x 4 -1
0 -2 1 2 1

I can't get this to look right. It is a 3x3 mul by a 3x2
Perform indicated operation. Maybe you can help me und