Which of the following relations shows a function?
a.{(5, -7), (6, -7), (-8, -1), (0, -1)}
b.{(4, -1), (4, -2), (3, -1), (2, 4)}
c.{(4, 5), (3, -2), (-2, 5), (4, 7)}
d.{(1, 4), (4, 1), (1, -4), (-4, 1)}

The larger of two number is 4 less than twice the smaller number. the sum is 41. find the numbers

Which question is not a good survey question? a.don't you agree that the financial crisis is essentially over? 63on average, how many hours do you sleep per day? c. what is your opinion of educational funding this year? d.are you happy with the availability of electronic products in your state?

Acyclist bike x distance at 10 miles per hour .and returns over the same path at 8 miles per hour.what is the cyclist average rate for the round trip in miles per hour ?