I’m unsure how to answer this with sig figs in mind:Use scientific notation to to express this quantity: 131. mg

Use scientific notation to to express this quantity: 131. mg
Explanation:
131. mg has 3 SF
131. mg = 1.31 * 100 mg
131. mg = 1.31 * 10^2 mg
Answer: 1.31 * 10^2 mg