Select the correct answer from each drop down menu

With #! i’ve tried to figure it out but i can’t.

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?

Which expression is equivalent to 4 square root 6 divided by 3 root 2