8. Which of the following can be expressed as a mathematical formula?

A scientific law

B. A scientific theory

C. A hypothesis

D. An observation

B. Scientific law

Explanation-

It's a statement that explains an idea based upon experimental observations. It's true based on the fact that they have always been observed to be true. It can be in a form of words and be expressed as a mathematical formula.

Examples would be the law of gravity and Boyle's law of gases.