Question

Which shows the expression below simplified? 0.00048 ÷ (6 × 10-4)

Answer 1

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).