7 ÷ 7^3 x 7

8^2 ÷ (8 - 4)^2

-4 + 3^3 ÷ 5

help pleas

Answer these questions showing your work plz

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?

Solve this problem! extra ! 3025/5.5 = a/90.75