What is number 8.b step by step?

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)