Which set of ordered pairs is a function?
{(-5,1).(-3,2).(-1,3), (1.4). (3,5)}
{(-6.-4).(-4-2). (0,0).(-42).(-6. 4)}
{(-2.1).(-42). 0,3), (4.1).(-2,5)}
{(-15).(-1,4),(-1,3), (-1,2), (-11)

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?

1foot = 12 inches; 1 yard = 3 feet

Adifferent website gives the cost for the first train as £56.88 and the second train as £20.11 with a £9.50 charge for cycle storage for the whole trip. how much would the journey cost you?