There are 450 students at a school. if each classroom holds 30 students , how many classrooms are needed at school?

Math it's appreciated. (picture provided)

Joe has some money in his bank account he deposits 45$ write an expression that represents the amount of money in joe's account

Using pert, adam munson was able to determine that the expected project completion time for the construction of a pleasure yacht is 21 months, and the project variance is 4. a) what is the probability that the project will be completed in 17 months? b) what is the probability that the project will be completed in 20 months? c) what is the probability that the project will be completed in 23 months? d) what is the probability that the project will be completed in 25 months? e) what is the due date that yields a 95% chance of completion?