Which function describes the arithmetic sequence shown?
−4, 0, 4, 8, 12, 16,
a) ƒ(x) = 4x + 8
b) ƒ(x) = 4x − 8
c) ƒ(x) = −4x + 8
d) ƒ(x) = −4x − 8

B) f(x) = 4x - 8
substitute in each value of x
f(1) = 4(1) - 8 = -4
f(2) = 4(2) - 8 = 0
f(3) = 4(3) - 8 = 4
etc.

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.