David estimates that he will spend 294$ for his purchase the actual cost is 300$ what is his percent error

Answer this question! 30 points and brainliest! only if you know the answer.

It says factor each expression 49x-28?

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.