How to solve x/9 + 16 ≤ 20

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?

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?

Janet drove 300 miles in 4.5 hours. write an equation to find the rate at which she was traveling