What is the two importance of sets in your daily life?

What are the cross sections of a pentagonal pyramid? How do you write sixty three hundreds as a decimal? The long hand on a clock goes around the clock face once every? What are some examples of a polygon? Do we have such a thing as unchanging values? What is Indian currency denominations? What is the french word for 8? How many sixteenth marks within an inch? Are 20 diagonals in a pentagon? How many tens are in 620? What is the difference between 125 degrees F and 50 F degrees below zero? If you were born in 1943 and your birthday is in June how old are you now? What is the sum of the arithmetic sequence from 3 to 90 which are divisible by 5? What dunes form at a right angles to the wind? Why is radical important? Is 2000 divisible by 50? What is the pH of a solution with a H plus equals 1.4 x 10-3 M? What does N3 mean? How do you write 0.1 in hundredths equivalent decimal? What does average speed and average time have in common?