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Find the third,fifth and seventh term sequence described by each rule a(n)=n+1

Plot the points (0,6), (3,15.8), and (9.5,0) using the graphing tool, and find the function

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.