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What is the sum?

Aparallelogram has two side lengths of 5 units. three of its sides have equations y = 0, y = 2, y = 2x. find the equation of the fourth side.

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?