Scientific Notation

Yes, it would look like this: 0.2 x 10^5 or 0.2E5

19 trillion can be written in scientific notation as 1.9 x 10^13.

It is: 4.32*10^8

It is: 2.3*10^6

It is: 2.8*10^-5

It is 6.35*10^5 in scientific notation

It is 1.56*10^-3.

It is: 7.18*10^-5

It is 4.503443661*10^9.

No, it is not. In many branches of science it is necessary to deal with numbers which are very large or very small and scientific notation is used to represent such numbers more easily.

It is: 4.5*10^-6 in scientific notation

It is: 7.2*10^0

Yes, although the one is not necessary. You can just write 10^-1 km

It is: 6.9*10^1 in scientific notation

It is 5.81*10^-4 in scientific notation

It is 7.7*10^-2 in scientific notation

0.0004506 in scientific notation is 4.506 × 10-4

2,590 can be written as 2.59 × 103 in scientific notation.

It is: 2,500,000,000,000 or as 2.5*1012 in scientific notation

It is written: 6.05 x 10^9

6.05 x 10^9

9.4 x 10^8 and 9.4E8 are both correct.

It is: 8.29*10^-5

It must have a mantissa.

7.04 x 10 to the 9th power.