How many dollars did they make?

Why did Frederick who was seven or eight not know the month of year of his sailing? What percentage of Americans attend church regularly? What equipment did the Romans use for maths? Is 289 divisible? What does the roman numeral MV mean? If you were born in 1981 how old would you be now? What statements must be true if WXYZ is a square? What is 3x21? What is 122 divided by 6? What is 27 percent of 200? How would you convert 1 in 10000 into scientific notation? What is the mesure of each interior angle of a regular decagon? What are three consecutive numbers that add up to 303? Does the 100 000 meter square identification for the military grid reference system change with different datums? How do you do the number nine hundred twenty-three thousand nine hundred twenty-three in expanded form? What is 52813 divided by 36? What is 5 meters subtracted by 300 centimeters? How do you write 54.6 in standard form? What is 2 divided by 2144? What empire discovered the decimal system we use today?