Weekly Math Homework - Q3:4

For what value of (y) is 3^3/3^y =1/9

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?

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.