On tuesday, david woke up at 6: 15
a. m. and went to sleep at 7: 45 p. m. how long was david awake?

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?

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 numbers are included in the set of integers? what numbers are not included?