Question

round 740.90 kelvins to three significant figures.

Explanation:

Step1: Identify significant figures

The first three significant figures of 740.90 are 7, 4, and 0. The digit after the third significant - figure (0) is 9 which is greater than 5.

Step2: Apply rounding rule

When the digit to be dropped (9) is 5 or greater, we round up the last significant figure we are keeping. So, 740.90 rounded to three significant figures is 741.

Answer:

741