How many hours is 8am to 215pm?

What property is 18 plus 0 equals 0 plus 18? Where do you find ferrocerium? Why do whole numbers raised to an exponent get greaterwhile fractions raised to an exponent get smaller? How do you know what the base of a triangle is? He saved 15 quarter and 7 times as many dimes How many dimes did he save? What 2 numbers that multiply to 221? 5 yards 2 feet equals how many feet? Why is a right angle called a right angle and not a left angle? Why is 25 and 36 square numbers? How long should it take an average swimmer to complete 50 meters? Write thirty-three hundredths as a decimal number? What is the Inside the diameter in inch of a basketball rim? How long does it take to walk 260 meters? What is 70 billion divided by 10 trillion? 12cm is how many times as long as 2mm? Is -15 a rational number? Is this a right triangle with sides having lengths 2.6 2.8 and 8.6? What is the least common factor for 10 and 15? Do you measure backpacks by kg or g? What is meant by fixed points in maths?