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Which ahows the graph of the solution set of 6x+4y< 12

The revenue each season from tickets at the theme park is represented by t(c)=5x. the cost to pay the employees each season is represented by r(x)=(1.5)^x. examine the graph of the combined function for total profit and estimate the profit after four seasons

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25