If the point (2, -10) lies on the graph of a direct variation , which represents the direct variation equation

Find the domain of the following expression: 1/(√x)-2

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?

Two trains leave stations 546 miles apart at the same time and travel toward each other. one train travels at 95 miles per hour while the other travels at 115 miles per hour l. how long will it take for the two trains to meet