Ben has $10 to spend on dinner. he can have a pizza delivered, drive to a burger place, or go to the grocery store to get ingredients for a fresh salad. in the end, he goes with the salad. if each meal would have cost him the same amount, what is ben’s incentive for choosing salad?

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?

How is this equation completed? i cannot find any examples in the book.

Bob paid $3 less than tim at a local pizza parlor. together they spent $7.80. how much did bob pay for pizza?