Math Help - scientific notation

1. scientific notation

0.008/0.00002

2. Re: scientific notation

Originally Posted by Louisana1
0.008/0.00002
$\frac{8\cdot 10^{-3}}{2\cdot 10^{-5}}=~?$

3. Re: scientific notation

4 x 10^2 right????????????

4. Re: scientific notation

Originally Posted by Louisana1
4 x 10^2 right????????????
Right.

5. Re: scientific notation

750000x20000x3000

6. Re: scientific notation

$(7.5 \times 10^5)(2 \times 10^4)(3 \times 10^3) = ?$

7. Re: scientific notation

45 x 10^12 or 4.5 x 10^12

8. Re: scientific notation

ok my teacher has an answer of 4.5 x 10^13 HOW did he get that

9. Re: scientific notation

$45 \times 10^{12} = 4.5 \times 10^1 \times 10^{12} = 4.5 \times 10^{13}$

10. Re: scientific notation

Originally Posted by Louisana1
45 x 10^12 or 4.5 x 10^12
Originally Posted by Louisana1
ok my teacher has an answer of 4.5 x 10^13 HOW did he get that
Well $45\cdot 10^{12}=4.5\cdot 10^{13}~!$

11. Re: scientific notation

So when you place the decimal between the 4.5 the exponent goes up one

12. Re: scientific notation

Originally Posted by Louisana1
So when you place the decimal between the 4.5 the exponent goes up one
I would hope that you learned long ago that you could multiply or divide by powers of 10 by moving the decimal point. Remember that? What is 1023.13 times 10? What is 1023.13 divided by 10?