Is y=3/4x-7 a linear or nonlinear function

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 the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

If rt is greater than ba, which statement must be true ?