What numbers does the square root of 82 fall between?

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi

Ineed the solution to this problem and the steps.