Which value must be added to the expression x2 + 12x to make it a perfect-square trinomia

to rewrite a literal equation you may need to divide by a number, or by a variable.

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the figures below are made out of circles, semicircles, quarter … find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations). remember that we'll also have to cut whatever areas we get in half, since we're only dealing im pretty sure that is the right answer

step-by-step explanation:

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