Question

(1.0×10^−15)/(4.2×10^−7) answer in two sig figs

Answer 1

Dividing the numbers given above, we obtain an answer of 2.380952381 x 10^-9. Writing the answer into two significant figures, then it will be 2.4x10^-9. Scientific notation is a method scientists use in order to handle very large or small numbers.

Answer 2

Dividing the numerical values of the given gives an answer of 0.238. Now, dividing the x10's gives an answer of x10^-8. The answer is supposedly 0.238x10^-8. Converting this value to a scientific notation with only 2 significant figures gives 2.4x10^-9.