Pls help middle school math!!!

U don’t need to graph just express it pls

Describe all the numbers that when rounded to the nearest thousand are 645,000

The highest point on earth is the peak of mount everest if you climb to the top you would be approximately 29,035 feet above sea level at remembering that amount is 5280 feet percentage of the height of the mountain would you have to climb to reach a point 2 miles above sea level

What is the ratio of the length of an object in yards to the length of the same object in miles?