Method involved controlling variables of hypothesis

Why should the scientific method be used to answer a question? a. it provides a way to test an idea without any bias. b. it provides a way to test a hypothesis. c. it provides a way to ensure all hypotheses are proven correct. d. it provides a way to quickly turn a hypothesis into a scientific theory.

Why is it that 85.48 rounded to two significant figures is 85 and not 86?

What additive are in a lavender tube for phlebotomists