Which of the following expressions represents a function?

{ (1, 2), (4, - 2), (8, 3), (9, - 3) }

y2 = 16 - x2

2x2 + y2 = 5

x = 7

About 300.000 people attended a festival

What is the prime factorization of 140 using exponents

Does origin mean (0,0)

The garden is circular in shape with a radius of 13 ft. What is the length of fencing material she will need to fence one complete circle around her garden? (Use 3.14 for the value of ∏ (pi))

Without parentheses, the expression 8 plus 30 divided by 2 plus 4 equals 27. Rewrite this expression with parentheses so that it equals 13; then 23

Ralph sold brownies for $ 0.63 0.63 a piece in order to earn money to buy baseball cards. If the cards cost $ 1.35 1.35 per pack, and if Ralph had no money left over after buying them, what is the least number of brownies he must have sold?

The segments shown below could form a triangle 9,4,15 true or false

What is 65.536 rounded to the nearest whole number

What is the fraction twelve twenties in its simplest form?

A cylindrical tank with radius 5 m is being filled with water at a rate of 2 m3/min. how fast is the height of the water increasing?