How many numbers between 1 and 100 (inclusive) are divisible by 3 or 4?

Students are given 3 minutes for each multiple-choice question and 5 minutes for each free-response question on a test. there are 15 questions on the test, and students are given 51 minutes to take it.how many multiple-choice questions are on the test?

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)