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Which property of addition is shown?
(t + u) + v = t + (u + v)

The perimeter of a stage is 116 feet. it is 17 feet wide. how long is it?

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent and the median amount spent? 40 25 8 36 18 15 24 27 43 9 12 19 22 34 31 20 26 19 17 28