Which shows the expression below simplified? 0.00048 : (6 * 10-4)

A 8 * 10-2

B 8 * 10-1

C 8 * 101

D 8 * 100

0.00048 : (6 * 10-4) should be rewritten as 0.00048 : (6 * 10^ (-4)). The symbol " ^ " denotes exponentiation. Without parentheses here, it appears that you want to subtract 4 from 10, which is inappropriate.

First focus on the " (6 * 10^ (-4)) " This is equivalent to 6 / (10^4). To divide 0.00048 by 6 / (10^4), invert the divisor and then multiply:

0.00048 * (10^4 / 6) = 0.00008*10^4, or 8*10^ (-5) * 10^ (4) = 8*10^ (-1) = 8/10 = 0.8.

Note that all of the possible answer choices need to be re-written. 10-1, for example, must be re-written as 10^ (-1).