How many hours 630am to 4pm?

Which of these is the most appropriate to express number of molecules per volume? Is 0.3 a rational or irrational? When in euler's formula when vertices and edges are given how to found the faces? Pete is 6 years older than Nick Nick is 7 years younger than Howie If Pete is 23 years old how old is Howie? How would you write 0.3 trillion? What fraction of 2 kg is 250 g? What is 3 2X equals 12 and 4Y minus X equals five? Are centimeter the big number in the ruler? How do you tell where the vertex of an angle is? How can you make number sentences true? Is 131 is composite number? What is comound interest? Is 0.6 a real number? Dilating a triangle changes the shape of the triangle but does not change its shape True or false? Is a 4x8 sheet of plywood actually 4x8? What are the french numbers up to 100? How many syllables are in the word brass? What is the smallest or largest number you could have started with to round to 42? How many 60 can go into 5400? What is the total angle if the numbers are 51 degrees centimeters 45 degrees centimeters and 72.1 degrees centimeters?