Marshall sleeps 8 hrs each day. how many hrs does marshall sleep each week? how many hours is marshall awake?

Well he is asleep a total of 56 hours a week (8x7) and there is 168 hours in a week (24x7) so 168 - 56 will equal how many hours he is awake the whole week.

8 hours x 7 days (a week) =56 hours                     
Marshall sleeps 56 hours a week.                         
 24 hours (A day) - 8 hours (sleeping) = 16 hours (Awake)
Marshall stays awake for 16 hours a day.
                           OR
24 hours (A Day)- 8 hours (Sleeping) = 16 hours (awake)
16 hours (Awake a day) x 7 Days (A week) = 112 hours a week
Marshall stays awake for 112 hours a week.