exam Maths Puzzle Numerical Ability

please help me with these promblems:

1. (2/3)^-3

2. ((3mn/2)^-1)^-4

3.20m^5/4m^2

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exam Other Question

I am supposed to solve the system 2x-y=6 and -4x+2y=9 by addition. I am so confused. Please help me. Thank you. Could I get some help with the following problem: Graph the line that passes through the point (3,0) that has a slope of -2/3. Thanks