What is the answer to this equation 1/2(10x-20)=5x-10

Suppose the first five terms of a sequence are 4, 5, 9, 27, 123. how could the next term in the sequence be generated?

The estimated number of people to attend the last bengals game of the season was 2000. the actual number of fans attending was 1200. by what percent did the estimate differ from the actual?

In the geometric progression –3, 12, −48… what term is 3,072?