Hello!
You can only add variables with the same base and exponent
8u^3 + 4u^3 = 12u^3
8u^2 + 0 = 8u^2
0 + -6u = -6u
6 + 3 = 9
Put the sums together
12u^3 + 8u^2 - 6u + 9
The answer is

Hope this helps!
The answer is 2.2 , you divide 99/45
Answer:
The way to copy a text is you first move your mouse over the text in-tell it turns blue then press control hit c then put your little mouse text thing where you want to copy the text click hit control hit v then your are done
Hope This Helps!!!