Let f(y) = y^4 -3y^3 +y - 3 and g(y) = y^3 + 7y^2 -2. Find f(y) + g(y). Write your answer as a polynomial with terms of

Let f(y) = y^4 -3y^3 +y - 3 and g(y) = y^3 + 7y^2 -2. Find f(y) + g(y). Write your answer as a polynomial with terms of decreasing degree.