Write .0000847 in scientific notation. a.8.47 x 10−4 eliminate b.8.47 x 105 c.8.47 x 10−5 d.8.47 x 106

Short C
Follow 2 rules.

1. when the number is between -1 and 1 count the number of zeros and add 1 to the power on 10.
2. When the number is between -1 and 1 the power on 10 is minus. 

A is not correct because there are 4 zeros. Therefore the power on the 10 should be -5 not minus 4. 

b and d are both eliminated because the power on the 10 on a number between 1 and - 1 is never plus. 

So A, B and D are all incorrect. That leaves C.

Answer C