pre-algebra - dividing integers

timer Asked: Aug 23rd, 2015

Question Description

The surface temperature of a deep spring -fed lake is 70 F.  The lake temperature drops two F for each yard below the lake surface until a depth of 6 yards is reached.  From 6 yards to 15 yards deep, the temperature is constant. From 15 yards down to the spring source, the temperature increases 3 F per foot until the spring source is reached at 20 yards below the surface.  What is the temperature at 10 yards below the surface?

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