How many hours is 900am to 530pm?

What is 2 tenths less than 3.668? What is 10 percent of 290000000? Calculate the measure of a central angle of a regular ten-sided polygon.? How many weeks left in 2013 as of June 14 2013? How many syllables in the word fragment? What is the area of a circle with a diameter of 21? How can you avoid systematic errors? What is 45 multiplyed by 600? What is the probability of rolling six dice all at once and getting 1 2 3 4 5 and 6? What is the mode of 12 21 15 51 51 25 52? How many miles per hour if a run 3.75 miles in 30 mins? Does a sphere have a side? Is 270 lbs bad for someone who is 6ft? What is the partial collusion? What is 6 percent of 31? What would be the size of the 50th triangle number shape? What is 5 add 400? What is 80 cube? How many dollars cost in itz? Is engine cc equal to power of engine?