The idea is to use the tangent line to at
in order to approximate
.
We have
so the linear approximation to is
Hence and
.
Then
Nellie has a watering can that contains 20 cups of water . She pours one quart of water on each plant in her yard. If Nellie use
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we can always find the slope of any line by simply using two points on the line, say let's use (3,4) and (-1,2)
