Find the value of x please

If you answer right ill give brainliest, : )

If square root x = -7, then x= -49 true or false

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?