Question

I only need to know the answers to numbers 9 and 10

Answer 1

9. 8x^4 and -3x^4 are both multiplied by x and to the fourth power, so you could combine them and get 5x^4.
10. 3x and 4x are both multiplied by x. you can combine them, and it will leave you with 7x+5.
Hope this helped!