Simplify. Rewrite the expression in the form 8^n8
n
8, start superscript, n, end superscript.
(8^{-8})(8^{3})=(8
−8
)(8
3
)=left parenthesis, 8, start superscript, minus, 8, end superscript, right parenthesis, left parenthesis, 8, cubed, right parenthesis, equals

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?