exam Maths Puzzle Numerical Ability

I am stuck on correct answer for:

sqare root of 0.64 =

I am not using a specific book. I am just practicing...

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exam Other Question

Find the reciprocal of (-1/5) (15). This is my last question. Reciprocal?? How do I figure that out i have no clue. 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?