Can someone pls answer this

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?

At which value in the domain does f(x) =0?

Why do interests rates on loans to be lower in a weak economy than in a strong one