Which of the following relations is a function?

{ (5, - 7), (4, 6), (-3, 8), (5, 9) }

{ (8, - 4), (-4, 8), (-4, - 8), (-8, 4) }

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

{ (9, - 1), (-1, 9), (9, 2), (2, - 1) }

You are given the expressions square root of 60 n and the square root of 2n 28 what is the smallest value of the n that will make each number rational?

Find the zeros of the function. f (x) = 9x^2-12x-5

Jordan paid $11.20 for 5 pears and 6 peaches. The cost of 3 pears is as much as 2 peaches. And no you do not divide 11.20 by 5 or 6. A) Find the cost of a pear B) Find the cost of a peach

The cooking club made some pies to sell at a basketball game to raise money for the new books. The cafeteria contributed four pies to the sale. Each pie was then cut into into five pieces and sold. There were a total of 60 pieces to sell.

Suppose that you are taking a multiple-choice exam with six questions, each has four choices, and one of them is correct.

One person can do a certain job in six days, a second person can do the same job in two days, and a third person can do this job in three days. how many days will they take to do the job together?

What is the area of this circle

What is the interest earned on $12,000 invested at 5.25% simple interest for 5 years?

Factor the GCF: 12a3b + 8a2b2 - 20ab3

Consider a sequence that follows a times 5 pattern: 1, 5, 25, 125, ... a. Write a formula for the nnth term of the sequence. Be sure to specify what value of n your formula starts with.