What is an example of equivalent for math?

2X X50. What one number can replace X? What is less than half but more than a whole? What is the type of rectangle with the greatest area for a given perimeter? Factor of 100x squared minus 9? What would you measure using kilometers? What object is about 2 feet long? What is the percent of 1 over 11? How do you write one and fifteen hundredths in decimal form? One hectare is how many gunthas? How many angstroms are there in 4.5 centimeters? How much is 80 percent of 36000? What is the fraction for 0.029? What does one hundred and twenty two thousand six hundred and eighty two divided by two equal? How do you write 0.034 as a percent? What is 3 56 to the nearest eighth of an inch? How many perpendicular does a rectangle have? What is 18.194 rounded To the nearest one? How do you solve 5 to the power x equals 0? What does control plus Z do? How can you get 100 by using only six sixes?