Question

Evaluate the following and write the answer in scientific notation :

I chose B...

Answer 1

What are the choices??!??!

Answer 2

A. 1.2 x 10-30
B. 1.2 x 10-13
C. 1.2 x 103

Answer 3

\[6x10^{-5} \div 5x10^{-8}\]
Expanded form would be 0.00006/0.00000005

Answer 4

Which equals 1200

Answer 5

Or u can save your effort by not expanding, a short cut would be to just subtract the power themselves meaning in this case
(6*10^-5) / (5 * 10^-8)



\[(6/5) \times \left( 10^{-5-(-8)} \right)\]

why the power is -5-(-8), its because its a division of powers. If its multiplication u add the powers instead.
After doing that u arrive at the answer
1.2* 10^3 neatly.