Which of the following expressions represents a function?

x = 1

{ (3, 2), (3, - 2), (4, 5), (4, - 5) }

y = 4x - 1

4x2 + y2 = 16

Why do different people not check and see if there is already the same question before posting.

Write an expression to represent: Nine less than the quotient of two and a number x

How is density calculated given mass and volume A. Mass divided by volume D. Difference of volume and mass

Eremiah has a batting average of 0.312 this baseball season. Express his average as a fraction in lowest terms.

Joey practices the guitar every 11th day and the trombone every 3rd day. Joey practiced both the guitar and the trombone today. How many days did Joey practices the guitar and the trombone again in the same day?

What is the solution to this equation 3x + 17 + 5) = 7x + 10

Round this number to the nearest 100. 3,817,453

There are 300 students in the middle school, 4 seventh graders are running for class president. Which type of survey below would give biased results?

Write the sum of 54+63 as the product of their GCF and another sum

In the number 6,779 which places contain digits where one digit is ten times as great as the other