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 Total imports of petroleum question

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T O P I C    R E V I E W
vbravo Posted - 03/26/2013 : 21:43:24
Here is the question from the sample problem I was given.
------------------------
The total imports of petroleum (in millions of barrels per day) in a given year is approximated by the polynomial
30x-527x+2082x+6055, where x represents the number of years since 1975. The corresponding total of exports of petroleum is -x+14x+23x+189. Write a polynomial that represents how many more barrels per day were imported than exported in a given year.

To find the polynomial representing how many more barrels per day were imported than exported in a given year, subtract the polynomial representing exports from the polynomial representing imports.

Write the subtraction statement.
30x-527x+2082x+6055-(-x+14x+23x+189)

Change to polynomial being subtracted.
-(-x+14x+23x+189)=x-14x-23x-189

*This is where I get lost, I don't understand what, 'Add the terms of degree 3, degree 2, degree 1 or degree 0" what do they mean?

Add the terms of degree 3
30x+x=31x *How did we get 30x?

Add the terms of degree 2
-527x-14x=-541x *How did we get -527x?

Add the terms of degree 1 *How did we get 2082x?
2082x-23x=2059x

Add the terms of degree 0 *How did we get 6055?
6055-189=5866

The combined terms are 31x,-541x,2059x, and 5866.

Therefore, 31x-541x+2059x+5866 million more barrels per day were imported than exported.

Thank you for your help,
Respectfully,
~Virginia
1   L A T E S T    R E P L I E S    (Newest First)
vbravo Posted - 03/26/2013 : 21:54:34
I GOT IT!!! yeah,

I figured it out by my self!!

Thank you for being there, in the event that I could not figure it out.

Thank you for all your hard work,
Respectfully,
~Virginia

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