This is an experiment of sorts, answer this IQ test level question.
9=72
8=56
7=42
6=30
5=20
3=?

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 graph represents the following piecewise defined function?

If 2(a^2+b^2)=(a+b)^2 then, > a+b=0, > ab=0, > a=b, > 2a=b