Answer:
Like terms are terms whose variables are the same.
We can only add them because if they does not have the same variable you do not actually know if the variables are equivalent and you will get the wrong answer.
Step-by-step explanation:
Ex: 4z,7z,108z,45z
Ex: 4w-2h+7a-2w
You can not add 4w and 7a because you do not know what the variables equal so you do not know the true number so add or subtract by.
Y=80x+270
If you want to know how to do it just let me know
Answer: 1208.96
Step-by-step explanation:
The volume of the cylinder is 
The volume of the prism is 
So, the total volume is 