A shirt costs $36 after a 25% discount. What was the original price?

If $36 is 75% of the original price, then original = 36 ÷ 0.75 = $48.

Which number is a perfect square?

81 = 9², so it is a perfect square.

−6 + (−3) − (−9) = −6 − 3 + 9 = 0.

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A bag contains 5 red, 3 blue, and 2 green marbles. What fraction of the marbles are blue?