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).

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step-by-step explanation:

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation: