Four
231.57 has five significant figures/numbers. All the numbers in 231.57 are significant.
3 significant figures.
2310 has 3 significant figures.
Five
6
Three of them which are 528
It is 5280
13, or any number greater than 5280.
Three. The last zero is just a placeholder.
5280
In the entire infinite supply of whole numbers, fractions, and decimals, whether positive or negative, there is only one single number that is equal to 5280. It is . . . . . 5280 .
Three significant figures. A significant figure is any non-zero digit or any embedded or trailing zero. Leading zeros are not significant.
There are exactly 5280 feet in each mile. In 82,341 feet therefore are 82,341/5280 = 15.595 miles, to the justified number of significant digits.
231.57 has five significant figures/numbers. All the numbers in 231.57 are significant.
5280 + 5280 + (¾ x 5280)...
There are 5280 feet in one mile. Therefore, 5280 feet is equal to 5280/5280 = 1 mile.
5280 + 5280.