1> Well, yo would just add the x^3 tems in the two fxns 1 + 5 = 6
2> If a is a constant, it will only change the coefficients of the functions, not the degree of the terms
so the greatest degree will still be 4 form the x^4 and 2x^4 in the two fxns
3> Similar to 2 except the lowest degree will be 1 from the 2x term
4> not sure
the constant will be 47
5> when the two functions are multiplied you will have a x^4 * 2x^4 = 2 x^8 term in the final answer.... dgree 8