How many hours between 9.30 AM to 6.40 PM?

How do you know if a relationship is proportional or not? Example of split-half method? Is a circle on a graph a relation? Name all the numbers from 1 to 100 which have the letter A in their spelling? What is the fraction for 360 of 3000? What division 3000 equals 100? What is the value of an eighth? When do you use percentages outside of maths at school? How many centimeters are equal to square feet? What is ten percent of one hundred thousand pounds? What is conversion subsystems and how can they be classified? Would l be rich? What does AR mean in sex? How do you get 20 percent of 45? What is the percentage growth from 127 to 470? What is the number 62.99685 rounded to 4 significant figures? What is four as a decimal? How many times does the word truth appear in the New Testament? Is a sphere regular? What is 43-28?