# Algebra

6. Based upon the 2010 census data, the total population of the us is 308,745,538 people. Approximately, what is this population in scientific notation?
A. 3.1 x 10^8**
B. 3.1 x 10^7
C. 3.1 x 10^-8
D. 31 x 10^7
7. What is the solution to (3 x 10^2) x (5 x 10^5) written in scientific notation?
A. 1.5 x 10^8
B. 15 x 10^8
C. 1.5 x 10^7
D. 15 x 10^7**

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1. Anything will help i'm trying to get a lot done by the 31st.

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2. #6, correct
#7, your 15 x 10^7 is correct, but not in true scientific notation
In SN, the number in front must have one digit before the decimal place, so

15 x 10^7
= 1.5 x 10^8 , (note since I made the 15 "smaller", I must make the 10^7 "bigger"

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Reiny
3. Thank you so much Reiny, this was very helpful.

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4. How come the first answer is 10^8 and not 10^-8

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