The scalar function div(grad f) = ? ? ? f (also written ?2f) is called the Lapalacian, and the function f satisfying ?2f = 0 is said to be harmonic. ?2f = fxx + fyy + fzz. Find ?2f for the following function and decide if it is harmonic.f(x, y, z) = x2yz - 
A. harmonic
B. not harmonic
Answer: A
Mathematics
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, find AB , or explain why the operation cannot be performed.
What will be an ideal response?
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Rationalize the denominator of the expression. Assume that all variables represent positive real numbers. 
A. 14
B. 2
C. 7
D. 2
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Use the distributive property to rewrite the expression. Simplify if possible.6(x + 9)
A. 6x + 6 B. 6x + 54 C. 54x D. 6x + 9
Mathematics
Multiply.(16)(61)
A. 1076 B. 966 C. 986 D. 976
Mathematics