Cones and pyramids both have only one base. a.)true b.)false

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?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n