Find the potential function f for the field F.F = i +  j - k

A. f(x, y, z) =  + C
B. f(x, y, z) =  + ln z + C
C. f(x, y, z) =  + C
D. f(x, y, z) =  + C


Answer: C

Mathematics

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Solve the problem.The average total sales of individuals in the sales department at a paper company has decreased approximately linearly from $154 thousand in year 1 to $127 thousand in year 5. Let s be the average total sales (in thousands of dollars) at t years. Find an equation of a linear model to describe the data.

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A.
B.
C.
D.

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Perform the indicated operations and simplify the result. Leave the answer in factored form. ? 

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B.
C.
D.

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