What is ridendancy?

What is a reflection math wise? How many grams of silver are in 90 percent silver coins? What is 3 hours and 18 minutes in a decimal? How many square slabs of 20 by 20 fit into a garden of 10 by 60? What is 15 percent of 263.00? Why do certain calendars repeat after 17 years - 2022 and 2023 will be the same as 2005 and 2006? What are the numbers that are not prime or composite? What is 105 in fraction? Can 17 be divided by whole numbers? What number is between 46 and 72? What is 27x cubed? How much is a million in 1000? Circumference of 1ft6in x 1ft2in? How much for a dozen eggs in 1978? What does alluva mean? What are the disadvantages of sampling? Is 27 a cubed number? How do write a quotient of a number and 5? What is the radius of 19.7? Can all polygons be circumscribed?