8x10^-3 is how many times as great as 4x10^-6

2 * 10 ^3 or 2000

Step-by-step explanation:

To determine how many times as great, divide

8 * 10 ^-3

4 ^ 10 ^-6

First divide the numbers

8/4 = 2

Then for the exponents, we know a^b / a^c = a^(b-c)

10^-3 / 10 ^-6 = 10 ^ (-3 - - 6) = 10 ^ (-3+6) = 10 ^3

Put back together

2 * 10 ^3