Solve the system by graphing

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?

Somone me i want to know what 18 hours out of 24 hours in a fraction

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?