If 154 people do both activities, then 196-154=42 people ski but don't snowboard.
If 42 people don't snowboard, then 200-42=158 people snowboard.
(6x^4) + (15x^3)(y^2) + (3x^2)(y^3) is your answer
As we are looking at descending powers of x. Look at the powers of the x. In the first one (6x^4), the power is 4, and 4 is greater than the other numbers given (3 & 2). Therefore, the order given above is correct.
hope this helps
