Which set of ordered pairs represents a function?

1) {1,9), (-5,-5), (1,-8), (-9,5) }

2) { (-3,9), (3,-4), (2,9), (3,4) }

3) { (3,-3), (-7,-5), (5,-5), (-1,2)

4) { (3,6), (2,1), (-8,4), (2,0) }

Equivalent fraction for 5/9, 4/15

6 is greater than or equal to the absolute value of - 7 - x

A fish tank initially contains 10 liters of pure water. Brine of constant, but unknown, concentration of salt is flowing in at 4 liters per minute. The solution is mixed well and drained at 4 liters per minute. a.

Mr. miller has $25 in his savings and wants to put $10 every week into the account. write an equation showing how much money he will have at any number of weeks. solve your equation to show the total amount of money mr. miller will have in 7 weeks.

A coin contains 1.25 grams of nickel and 3.75 grams of copper, for a total weight of 5 grams what percentage of the metal in coin is copper

Find the value of y when x=3: y = 2x + 1

Finley makes 1 batch of her favorite shade of orange paint by mixing 5 liters of yellow paint with 3 liters of red paint. How many batches of orange paint can Finley make if she has 15 liters of red paint?

If the circumference of the circle below is 25 cm, what is the length of, to the nearest hundredth?

37917545 in three different addition expression ways

What is 1 fourth times 3 sevenths