Why is it useful to express a number in scientific notation?A.Scientists couldn't use calculators to do their work otherwise.B.Scientific notation removes fractions from math problems.C.It makes large numbers easier to compare and work with.D.Scientific notation is more accurate than writing out a number.

The usefulness of expressing a number in scientific notation primarily lies in option C. It makes large numbers easier to compare and work with. Scientific notation allows for the simplification of calculations, especially when dealing with extremely large or small numbers, which are common in scientific fields. It provides a way to express these numbers in a concise and standardized format, making them easier to understand, manipulate, and compare.

Option A is incorrect because the use of calculators is not dependent on scientific notation. Calculators can work with numbers in various formats.

Option B is also incorrect. Scientific notation does not necessarily remove fractions from math problems. It is a method used for writing very large or very small numbers, not fractions.

Option D is not entirely correct. Scientific notation is not inherently more accurate than writing out a number. The accuracy depends on how many significant figures are used in the scientific notation. It can, however, prevent errors in counting the number of zeros in very large or small numbers.