exam Maths Puzzle Numerical Ability

Tickets for a play at the community theater cost $16 for an adult and $2 for a child. If 210 tickets were sold and the total receipts were $2380, how many of each type of ticket were sold?

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I am stuck on correct answer for:

sqare root of 0.64 =


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Find the vertex for the function f(x) = x^2+6x-4