Find the x-intercepts of the parabola with vertex (-4, 2) and y-intercept (0, -30). write your answer in this form: (x1, y1), (x2, y2). if necessary, round your answer to the nearest hundredth.

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?