How many zeros in 25lack?

Why number 10 is important in our place value sistem? What is 7 out of 17 as a percentage? What is the roman word for fifty? What is equivalent to 5 and -2y 14x plus 3? How much of a acre is 6750 sq ft? What is 9.31 as percent? What is the missing number in following sequence 1 16 100 169? The ray of light that strikes a surface? Why set suare? Why should a zero CIR? How do you find the measures of a rhombus with two diagonals? The sum of two numbers is 16.4 their difference is 0.8 what are the two numbers? What is 9990 rounded to the nearest hundreds? How many times does it say to be still in the bible? How many barrels per inch in a 500 barrel tank? Is 5 6 equivelent to 2 14? Is anything times 8 equal to 100? What is the missing number two blank divided by seven is 35 remainder 3? How many 3-digit numbers are there in all? Must Variables be created before being used?