Tent:
Width = 5
Length = 10 so 5x10 = 50
Air mattress:
3x6 = 18
So 50 - 18 = 32 feet.
David will have 32 feet of space in the tent leftover for his other things.
This is a simile as it compares two things using the word like. It compares her running across the grass to a cheetah chasing its prey, implying she is running very fast
I'm pretty sure the revolution follows next so ya.
Having good judgment; fair and sensible
"no reasonable person could have objected"