Review of Significant Figures: How many significant figures does the result of the following calculation have: 24.78 * (37.3-31.72) ?

The significant figure of the result is 138.8

Step-by-step explanation:

24.78 * (37.3 - 31.72)

Solving the bracket first:

37.3 - 31.72 = 5.58

A zero is added to 37.3 before the substraction, so;

37.3 - 31.72 = 37.30 - 31.72 = 5.58

Following the rule of significant figure; we have the answer of the substraction as 5.6 since the least number of significant is one decimal place.

The new expression will be:

24.78 * 5.6 = 138.768

Therefore, the result of our expression 138.8 by following the rule of significant figure