Whats the literal equation for y y-3x=13

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?

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

Which of the following is the correct ratio for converting kilograms to grams