I need help doing this.

To complete your spring schedule, you must add calculus and physics. at 9: 30, there are three calculus sections and two physics sections; while at 11: 30, there are two calculus sections and three physics sections. how many ways can you complete your schedule if your only open periods are 9: 30 and 11: 30?

What is the value of the expression 9+n/3-6 when n = 12? 1. 5. 7. 12.

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .