So the paraboloid is given by
which holds for
To make sure this is correct, plug in
Both of these hold, so the answer is correct.
If a phone card is used to make a long distance phone call, you are charged $0.50 per call plus an additional $0.31 per minute.
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So the paraboloid is given by
which holds for
To make sure this is correct, plug in
Both of these hold, so the answer is correct.
From the explanation below,
a= -10 and b= -4
a= -10 and b= -4