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The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line

An architect is designing a water fountain for a park she uses the given function to model the water jet flowing from the fountain nozzles where h(x) gives the height of the water jugs in feet x feet from the starting point h(x)=-1/20x+x+15

The perimeter of a stage is 116 feet. it is 17 feet wide. how long is it?