# Algebra

Can I have some help doing some of my math homework?
9. Dory bought 2 computers on sale for \$210.99 each. He sold them to his friend for \$240.00 each. What was his profit?
A. \$52.99**
B. \$58.02
C. \$421.98
D. \$480.00
10. What is 0.00000512 in scientific notation?
A. 5.12 x 10^6
B. 512 x 10^5**
C. 5.12 x 10^-6
D. 512 x 10^-5
11. What is 27/6 written as a decimal?
A. 4.2
B. 4.3**
C. 4.4
D. 4.5
Anything will help!

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1. #10 will need to be checked for sure... Think about the direction you have to move the decimal point.

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2. #11 is not quite right yet...
27 divided by 6 is 4, and then there are three left out of 6...
that is 3/6 turned into a decimal number...

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3. #9 is not quite right yet either...
sold for - bought for = profit.
then the profit is times by 2

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4. So #11 would 4.4 instead of 4.3? p.s. I love your name

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5. WHat is 3/6 as a decimal? It will help you with #11

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6. For #10 it would be C or D but im thinking D so im not sure.
And #9 would be C?

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7. For #10 check how many times you would move the decimal from 5.12 back to where it is in the original question. The number of movements will tell you the exponent.

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8. 3/6 would be 0.5 in decimals

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9. So that will help with #11 : )

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10. Oh so #10 would be A

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11. And #11 would be D

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12. Sold for - bought for = profit
\$240.00 - \$210.99 = profit
Profit = 29.01
Then he did it for 2 computers.

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13. #11 as D is correct : )
Make sure you write down the full solution in your notebook so you see how we did the last 3/6 to get the .5 : )

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14. #10 is not A, as you are moving in the NEGATIVE direction... thus the exponent must be negative...

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15. OMG Thank you so much Ms. Pi!!
You helped a lot!

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16. You are very welcome! : )

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