Given:
3 x 10^7 times as great as 2 x 10^-4
we are to multiply the two expression
one thing we must know is that in multiplying, we add up the powers. using lawas of indices.
so,
3 x 10^7 X times 2 x 10^-4
= (3 x 2) x 10^7 + (-4)
= (3 x 2) x 10^7-4
= 6 x 10^ 3
therefore, the correct option is the third option which is 6 x 10^3
