Homework Help: algebra

Posted by Anonymous on Monday, January 10, 2011 at 12:54am.

Write Home Depot’s 2002 sales and 2006 sales in scientific notation.
2002: (5.82×10^10)
2006: (9.08×10^10)
This part I got. but can someone help me with the second part...
1) Find the increase in sales from 2002 to 2006.

I think the answer is:

(9.08×〖10〗^10 )-(5.82×〖10〗^10 )=3.26×〖10〗^10

If so then answer this:

2)What was the percent growth in Home Depot’s sales from 2002 to 2006? Do all your work by using scientific notation.

algebra - Dr Russ, Monday, January 10, 2011 at 1:01am
So the precentage increase is

3.26×10^10 x 1 x 10^2/(5.82×10^10)
algebra - Anonymous, Monday, January 10, 2011 at 1:06am
Can you answer where that came from?
algebra - Dr Russ, Monday, January 10, 2011 at 1:11am
percentage increase is
increase x 100/starting amount.

I have put 100 as 1x10^2 as you have been asked to work in scientific notation.
algebra - Anonymous, Monday, January 10, 2011 at 1:41am
Thanks for the help.

Are you sure though that it is not the change in value divided by the current value?

Using what you told me i got a 56% change in value. And 9.08x10^10 is clearly not more than 50% of the original value of 5.26x10^10. Otherwise the new value would have to be over 10.52x10^10.
algebra - Reiny, Monday, January 10, 2011 at 10:47am
I agree with Dr Russ

the percentage increase
= (9.08 x10^10 - 5.82 x 10^10 )/(5.82 x 10^10)
= .5601
or 56% increase

check:
156% of 5.82 x 10^10
= 1.56(5.82 x 10^10
= 9.08 x 10^10

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