Simplify this rational expression -9x/4y * 8x/-9

Ben bowled 124 and 188 in his first two games. what must he bowl in his third game to have an average of at least 160?

Which of the following graphs represents the function f(x) = 2^x

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?