How many hours between 9.30 AM to 6.40 PM?

How is Argus symbolic? What is the volume of a cylinder with the following dimension radius 6ft height 24ft? How many diangles in a heptagon? As a cell gets larger its surface area to volume ratio? What state is shaped like a circle? How do you write -20 in french? Which circumference is greater 4.25in 4.246in or 4.308in how do you know? How many photons correspond to 3.96E-17? Thankyou for telling me the answer answercom? What is 3 fives and a jack worth in cribbage? What is the next number in the sequence 1 3 6 10 15 21? How can you know if its a prime number? What can be said of points lying on the line through the origin bisecting the 2nd and 4th quadrant? How long will it take you to drive 42 miles at 10 miles per hour? How many brick will it take to lay a 12ft x 12ft patio floor? What is 7283 divided by 8? How to figure out miles per hour? What does it mean if a number is divisible by another number? What is steam drum thickness calculation? Can the concavity of a curve be determined by differentiation?