round 4,300.90 milligrams to four significant figures. milligrams

Explanation:

Step1: Identify significant figures

The number 4,300.90 has six significant figures. Non - zero digits (4, 3, 9) and zeros between non - zero digits (the 0 between 3 and 9) and trailing zeros after a decimal point (the 0 after 9) are significant.

Step2: Round to four significant figures

We start from the left - most non - zero digit. We want four significant figures. The fourth significant figure is 0. The digit after it is 9. Since 9>5, we round up the 0. So 4,300.90 rounded to four significant figures is 4,301.

Answer:

4,301