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If each side of a square anti-drug poster and slogan is increased by 4 in., its area becomes 144 in².
a. What is the measure of its side after increasing it?
b. What is the length of the side of the original square anti-drug poster and slogan?
c. Supposing the area of the square anti-drug poster and slogan is 128 in², find the length of its side.

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