This is an example of which property?

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

The suare root of 9x plus 7 plus the square rot of 2x equall to 7

Tom drove 206 miles in 3.9 hours. estimate his average speed.