Professional basketball player, Joe Johnson, is 6 feet 7 inches tall. There are 2.54 centimeters in 1 inch. What is Joe’s height in centimeters? (A quick response would be nice :)

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