What was the drivers change in the elevation in each interval

98-6 =92, 92feet/4 intervals = 23 feet per interval.

2. root 6 is the right answer

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.