Find the sum of -2x+5x-7 and -3x-4x-6
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Assuming it's a constant rate, there is a four hour difference from t=1 and t=5, so subtract the difference in depth (0.03 - 0.06) and divide that by four.
-0.03/4 = -0.0075
So your change in depth in feet per hour is -0.0075
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-0.03/4 = -0.0075
So your change in depth in feet per hour is -0.0075