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If the measure of xyz is 81 what is the measure of yz

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²

Your friend uses c=50p to find the total cost, c, for the people, p, entering a local amusement park is the cost of admission proportional to the amount of people entering the amusement park? explain.