Could you get me a coffee from the cafe? I'm swamped with projects and homework. If you can, thanks! I'll be at my apartment 5 floors above you.
Sure I can! I'll have to go down 4 floors to the cafe and then up 9 floors to get to your apartment. -4+9=5. I'll be 5 floors above my apartment to give you your coffee.
My apartment's so big, I can easily get lost in here. I wonder how many floors are between the highest and lowest floor. To find the difference, I'll have to do 20-0 which equals 20. The difference between the highest and lowest floors in my apartment is 20 floors.
I want to see how many floors I can walk down in 5 minutes. Since I can walk down 2 floors in 1 minute, the number of floors I can walk down in 5 minutes is -2(5)=-10 floors. I am 2 floors above my apartment because I live on the 8th floor. So, my position would be +2 from my apartment.
Yesterday, I took 15 minutes to walk down 100 feet, so I walked -100/15=-6.6...feet per minute. Today, I walked down 84 feet in 12 minutes, so I walked -84/12=-7 feet per minute. Basically, I walked faster today then I did yesterday.