Asandbox is 1 1/3 feet tall 1 5/8 feet wide and 4 1/2 feet long how many cubic feet of sand will it hold (volume =length •width•height)

Four individuals pool money together to start a new business and agree to split the profits equally. n invests $6,000, x invests $2,000, y invests $8,000 and z invests $4,000. if the profits for the first month were $100,000, y receives than if the profits were divided in proportion to how much they invested.

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What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?