How big is 1800mm?

What is three different ratios equal to 2 over 5? What is the importance of local hour angle? What is 6050.287 rounded to the nearest hundred? What is a decimal that is equivalent to 89.5? What is eight minus negative 21? How can you find the volume of sand in a pipe in metric? Is one-fourth an integer? What is 10 thousand times 10 thousand? How many heartbeats a minute a baby has? Is -94.92 a rational or an irrational number? How many 3-digit numbers are divisible by 13? Can you trip a small 12v solenoid remotly from 12 inches away with radiowaves or a larger magnet? Prove that sin theta power 8 - cos theta power 8 equal to sin sq Theta -cos sq x 1-sin sq Theta cos sq theta? How do you write thirty and twenty hundredths as a decimal? What benchmark fraction is closest to 23 percent? What is volume of a sphere when the radius is 74.9 mm? What is 100 thousand in roman numerals? What are the odd numbers more than 20? What value is a 1967 universal statuary corp number 420 elephant? Why you use centimeters?