Agroup of hikers is descending a mountain at a rate of 400 feet per hour. what is the change in the elevation of the hikers after 6 hours?

Consider the set of all four-digit positive integers less than 2000 whose digits have a sum of 24. what is the median of this set of integers?

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122