Which of the following expressions represents a function?

y = x2

{ (9, 2), (4, - 2), (5, 3), (9, - 4) }

x = - 3

x2 = 25 - y2

The diameter of a circle is 18 kilometers. What is the length of a 120° arc?

I am the product of a number and another nonzero whole number. What am I

How do I simplify rational exponents

What is the equivalent expression to-7 - (-2.5)

Joe has some pocket money he spends 50 percent of it he then spends another 1.50 he has 75p left how much pocket money did he have

A simple random sample of size n from a finite population of size N is a sample selected such that each possible sample of size n a. has the same probability of being selected b. has a probability of 1/n of being selected c.

When plotting on the coordinate plane which axis do you move along first?

Last year, Melanie drove 1,200 miles on vacation, 8,850 miles to and from work, and 5,600 miles doing other activities. How many miles did Melanie drive in all? Which clue word (s) tell you to add?

Find the smallest perfect square which is divisible by 1930.

In Mrs. Hu's classroom, 4/5 of the students have a dog as a pet. Of the students who have a dog as a pet also have cat as a pet. If there are 45 students in her class, how many have both a dog and a cat as pets?