Find an equation for the ellipse described.Center at (4, 2); focus at (12, 2); vertex at (14, 2)

A.  +  = 1
B.  +  = 2
C.  +  = 1
D.  -  = 1


Answer: A

Mathematics

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Find the second-order partial derivative.Find fxx when f(x, y) = x6y3 - x7y7 + 17x - y.

A. 30x5y3 - 42x6y7
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