Which of the following ordered pairs represents the solution to the system given below?

x − 3y = 12
2x + 6y = 60

(0, −4)
(12, 0)
(3, 21)
(21, 3)

How many heads would you expect if you flipped a coin twice? first, fill in the table below with the correct probabilities. hint: the sample space for flipping a coin twice is {hh, ht, th, tt}. a = b = c = f

What is the value of x? enter your answer in the box.

How do you find the distance of each number from the mean