Simplify the following expression. 3y - 2x + z - 2x + 3(x + y)

Alocal concert promoter purchases 2 3/4 pages of ads. when one of the concerts is cancelled, the promoter cancels 1 5/8 pages of ads. how much advertising space is the concert promoter actually using?

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What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9