At 0 hours: 24 boxes
After 1 hour: 24/2 = 12 boxes
After 2 hours: 12/2 = 6 boxes
After 3 hours: 6/2 = 3 boxes
She will have 3 boxes after 3 hours.
Hope this helps :)
Please note that you have to use the reason vert. opp. angles to find x, hope it helps:)
B -6 because absolute value ignores negatives