Answer:
#1: 1000
because there are 3 sets of 6 hours in 18 hours, so for each of those sets you would take your number, which at first is 250 and double it which makes 500 then you double that to 1000
thats the first one for you, it seems as if it says you are in high school so you should know this simple math :). keep trying! and try getting a calculator before asking. (yes i'm to lazy to do the rest)