On November 12th 2014 the Philae lander touched down on comet 67P/C-G

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?

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Ineed with number 6 , explain how to get 1978