One pipe fills a storage pool in 8 hours. a second pipe fills the same pool in 4 hours when a third pipe is added and all three are used to fill the pool, it takes only 2 hours. find how long it takes the third pipe to do the alone.

i dont get it. where are the "descriptions"?

i belive those are the ones that are under 90 degreese.

55 degrees because 55+55=110 degrees

assuming this is from a math graphing problem.

7 would be on the x-axis which is the horizontal line on the graph

84 would be on the y-axis which is the vertical line on the graph