What are the difference of 21?

How many square feet equal 20 square meters? What is the surface area of a sphere with a circumference of 9cm? What decimal does the fraction 146 equal? What is the tolerance for a 130 H7 hole? What is120 times 8 plus 15? What is a statistically significant result? What fraction is 36 of 40? How are the bases of a cylinder and a prism similar? Given 2 hourglasses of capacities 7 and 11 minutes how can you measure 24 minutes? How tall will a girl be if her parents are 5'0 and 5'10? How do you calculate the sum of all numbers from 1 through 200? What is A measure of number of square units needed to cover the outside of a figure or solid? How do you line up 4.35 plus 5.4? How many stones in 75.90 kilos? What shape has a triangular base and 3 other triangule faces? What is 79 an of g? How do you get the square footage of a room is 12 feet by 20 feet? What is three and two thirds squared? How many times does 2 go into 111? How would you use the slope and y intercept to fill a table?