exam Maths Puzzle Numerical Ability

Find the missing polynomial: (-2x^2+x-3)-(-3x^2-4)+(?)=5x^2+2x-1

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I am trying to figure out how to find the indicated measure for a parallelogram. One side has S and V with a+7 in between, the other side has T and U with 4a-2 in between. I need t please help me with this problem

the product of $25 and the number "M" of club memberships is greater than or equal to $500