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!
Answer:
Q1. m=8
Q2. Divide by -5
Q3. It's being divided by 5
Q4. It is being multiplied by -5
Answer:
the shortest route is from cabin site to B
Step-by-step explanation:
see my attachment
400(1.07)=428
28(5)=140
140+400= 540.
$540 is your answer
4(d-1), if you expand it gets 4d-4.