Find the slope of the linear functions y= 3 - 1/2x

Which of the following would represent the sum of 3 consecutive integers if x is the first integer?

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?

Which of the following best describes the figure?