Nitrogen makes up how much of Earth’s atmosphere? 100% 78% 22% 0%

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?

Thelime contains the point(-3,0) and parallel x-3y=3( show all work)

8.74 rounded to the nearest whole number