exam Maths Puzzle Numerical Ability

I have no idea how to even start this problem, please help.

solve each of the following systems by using either addition or substitution. If a unique solution does not exist, st

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exam Other Question

A rectangular painting has dimensions x and x + 10. The painting is in a frame 2 in. wide. The total area of the picture and the frame is 900 in. sq. What are the dimensions of the painting? How do you do polynominals?(using boxes)