How many significant figure for 20 000?

How many European pallets fit in a 40 foot container? What does adjustment mean in terms of Law? What is the answer of 36 squared? What is 100 minus one minus two minus three minus four minus five minus six minus seven minus eight minus nine minus nine minus eight? What is 576 as an exponent? If 6 months is called halfyearly What is 9 months called? Is a cw2 higher ranking than a 1lt? What would you do to find the volume of a seashell? Why you choose shape of the heart? How many miles per hour are you going if i travel 3 miles in 20 minutes? What is number and word notation for 427900000000000? What number is ciii? What is 14 simplafid as a fraction? Getting at least one head when tossing eight fair coins? What does 0x2 mean? Why do Americans use Fahrenheit instead of celsius? How much do marbles weight? Is 100 feet per 2 seconds a unit rate? 90 ones equals how many tens? How is seventeen-tenths written as a decimal?