For the particial sums above billy said 20 plus 90 is 110 plus 200 equals 310. Is billy correct ? Use models properties or equationd to represent and explain your thinking

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?

Need ! the total ticket sales for a high school basketball game were $2,260. the ticket price for students were $2.25 less than the adult ticket price. the number of adult tickets sold was 230, and the number of student tickets sold was 180. what was the price of an adult ticket?

Do you mind if you guys me with this question i’m on number 8