What is the greatest possible error for a measurement of 8 fluid ounces?

There are 45 questions on your math exam. you answered 810 of them correctly. how many questions did you answer correctly?

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible

What is 140% of 25? because i need