exam Maths Puzzle Numerical Ability

How do I solve these problems? The problem states to: find the product and simplif:(x-3y)^2

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exam Other Question

c^2 +3c/3^2+2c-3 / c/c+1

Can you show me how to solve
Can someone help me on this problem?

I need to find values for m and b in the following system so that the solution to the system is (-3, 4).

5x + 7y = b
mx + y = 22

Thanks so much,
Sher