What is the formula for the following arithmetic sequence?

12, 6, 0, -6,

a. an = 12 + (-6)( n - 1)
b. an = 12 + 6( n - 1)
c. an = -6 + 12( n - 1)
d. an = 6 + 12( n - 1)

Fiona and her friends are playing a game by guessing where a coin will land when it is randomly dropped inside the square shown below. fiona guesses that the coin is likely to land in the blue area. which explains whether or not fiona is correct and why?

Can you simplify 4/7? 24 points will be awarded!

David must install fencing around a lot that is shaped like a right angle.the side of lot that runs east-west is 200 ft long.the side of the lot runs north-south is 125 ft long.calculate how many feet of fencing he will need to surround the entire lot.