Ted buys blocks
of spruce for 
dollars each, and 
blocks of mahogany for 
dollars each. In a given month, Ted spends a total of 
dollars, where 
. The price of a block of mahogany, given that a block of spruce costs 5/9 as much as a block of mahogany, and Ted has bought 12 blocks of spruce and 15 blocks of mahogany for a total cost of $9750. Write an equation whose solution is the given quantity.
1 answer:
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has gradient
which at the point (-1, 4, 3) has a value of
I'm not sure what the given direction vector is supposed to be, but my best guess is that it's intended to say , in which case we have
Then the derivative of at (-1, 4, 3) in the direction of
is