How many 16ths are in 15/16

Which expression is equivalent to 3^3 + 2^2?

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?

Use the quadratic function to predict f(x) if x equals 8. f(x) = 25x2 − 28x + 585