Can someone please help me

If i have a 24 in loaf of bread and i cut it into two pieces one 9 in how long was the other

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.

What is always true when two whole numbers are subtracted?