How many hours is 9am to 3.30pm?

What are the prime factors of 6 and 12? Why are payments considered negative numbers and deposits considered positive numbers? What are two angles that have the same vertex share a common side and do not overlap? How much does an object weigh if its volume is 40 cubed cm? What group of people found the first known value of PI? What is 3 point 8 written as a percent? How old would you be in 2010 if you were born in 1990? What are the cube roots of 27 and 125? What is the 6-by-6 rule for presentations? How many square feet is equal to 1 vaar? What is the ratio or rate as a fraction in simplest form for 9 goldfish out of 20 marbles? Veracious in a sentence? 345 millmeters equals how many meters? If the degree measure of an angle is 40 and deg less than 3 times the degree measure of its supplementary angle what is the degree measure of the angle? What is 58.139 rounded to nearest hundredth? What is an estimate cost in materials only for 500 square feet as I plan to do the job myself? What is the answer to -t plus 2 equals 12? What is 130 over 243 in simplest form? What is a limitation or restriction? How old are you if born in May 1972?