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What are the soultion(s) to the quadratic equation 40- x^2=0

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

Which expression is equivalent to the expression for the perimeter of the larger garden?