Final answer:
The digit '3' in 43,862 and 75,398 represents different place values, being in the hundreds and thousands place respectively, and each '3' is considered significant in terms of significant figures.
Step-by-step explanation:
When discussing the 3s in the numbers 43,862 and 75,398, we are examining the place value and significance of the digit '3' in these numbers. In 43,862, the '3' is in the hundreds place, signifying 'three hundred'. In 75,398, the '3' is in the thousands place, signifying 'three thousand'. When dealing with significant figures in measurements, each '3' in these numbers is considered a significant figure, contributing to the precision of the value they represent.