Which algebraic expression is not equivalent to 13x + 10? A. 10(x + 1) + 3x B 4x + 3 + 8x + 7 0. C. 13 + 2x + 3x – 3 + 8x D. 20x – 2 – 7x + 12

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?