Question

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.

Answer 1

Answer:

$There\ were\ 1.5\times 10^8\ more\ members\ in\ January\ 2013\ than\ in\ October\ 2009.$

Step-by-step explanation:

$Number\ of\ members\ in\ October\ 2009=5\times 10^7\\\\Number\ of\ members\ in\ January\ 2013=2\times 10^8\\\\Number\ of\ members\ in\ January\ 2013=2\times 10\times 10^7\\\\Number\ of\ members\ in\ January\ 2013=20\times 10^7$

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

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