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) }

Insert parentheses in expression 2 so that it has a value of 4. Then show why your expression has a value of 4. 2^2 + 4/9 - 6

There was some pie left over after a party. 1/2 blueberry, 3/8 cherry, and 1/3 pumpkin. Three friends decided to split the remaining pie between them. How much pie did each friend get? (I messed up the last question, sorry)

You receive a pay raise of 5%, then a cut of 5%. If your original salary is $45,000, what is your new salary after the raise and your original salary after the pay cut.

Perimeter of dog house is 122 inches the width is 25. How many square feet of carpet do I need to cover the floor of doghouse

The diagram below shows two parallel lines intersected by a transversal. Tell whether each sentences is True or False. 1: Angle 1 and angle 8 are alternate exterior angles. 2: Angle 2 and angle 4 are corresponding angles.

Dmitry calculated that he needs 6s^2 square inches of wood for each crate he makes. Simplify the expression when s is replaced by t^4.

A person's temperature is 40° C. What would it be in Kelvin? A. - 313 K B. 313° C C. 313 K D. - 313° C

Nicole bought a piece of property for $12,000. She sold it for $15,000. What is the percent of increase? A. 20% B. 10% C. 15% D. 25%

Ann is 5 feet 3 inches tall. To find the height of a lamppost, she measured her shadow to be 8 feet 9 inches and the lamppost's shadow to be 12 feet. To the nearest inch, what is the height of the lamppost?

Subtract: (3x^2 - 8x + 3) - (-5x^2 + 4x - 5) A. 8x2 - 12x + 8 B. - 2x2 - 4x - 2 C. - 2x2 - 12x + 8 D. 8x2 - 4x - 2