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In October 2009,there were approximately 5x10^7 members of a website. In January 2013, there were approximately 2x10^8 members. How many more members were there in January 2013 than in October 2009? Write your answer in scientific notation. There were__________more members in January 2013 than in October 2009.

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sam4040

Answer:

[tex]There\ were\ 1.5\times 10^8\ more\ members\ in\ January\ 2013\ than\ in\ October\ 2009.[/tex]

Step-by-step explanation:

[tex]Number\ of\ members\ in\ October\ 2009=5\times 10^7\\\\Number\ of\ members\ in\ January\ 2013=2\times 10^8\\\\Number\ of\ members\ in\ January\ 2013=2\times 10\times 10^7\\\\Number\ of\ members\ in\ January\ 2013=20\times 10^7[/tex]

More members in January 2013=Number of members in January 2013-Number of members in October 2009.

[tex]The\ number\ of\ members\ that\ are\ more\ in\ January\ 2013=20\times 10^7-5\times 10^7\\\\The\ number\ of\ members\ that\ are\ more\ in\ January\ 2013=(20-5)\times 10^7\\\\The\ number\ of\ members\ that\ are\ more\ in\ January\ 2013=15\times 10^7\\\\The\ number\ of\ members\ that\ are\ more\ in\ January\ 2013=1.5\times 10\times 10^7\\\\The\ number\ of\ members\ that\ are\ more\ in\ January\ 2013=1.5\times 10^8\\\\There\ were\ 1.5\times 10^8\ more\ members\ in\ January\ 2013\ than\ in\ October\ 2009.[/tex]

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