What is the gcf of 12 and 8

Im literally having a mental breakdown

Consider the first four terms of the sequence below. what is the 8th term of this sequence?

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.