9.1 x 10−13kg is equal to how many ng.

.91 ng

Explanation:

So for the first one the conversion factor which is the first blank in your first question is (1/100) and the second blank which would be (74)(1/100) is 0.0174

The second one would have two conversion factors where the first blank would convert to grams, so the conversion factor for the first blank is (1000/1), then converting from grams to nano grams, whose conversion factor is (1,000,000,000/1).

So in general the second one is 9.1 x 10^-13 (1000/1) x (1,000,000,000/1) = .91 ng

Hope my explanation is easy to understand.- Ryan Brown indy

i'm wiling to try and you : )