Solve the equation.9x = -27
A. -36
B. 36
C. -3
D. 1
Answer: C
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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
Solve the problem.In a Psychology class, the students were tested at the end of the course on a final exam. Then they were retested with an equivalent test at subsequent time intervals. Their average scores after t months are given in the table.
Using a graphing utility, fit a logarithmic function y = a + b ln x to the data. Using the function you found, estimate how long will it take for the test scores to fall below 84%. Express your answer to the nearest month.
A. 12 months B. 20 months C. 8 months D. 10 months
How many pages are necessary to make 1,050 copies of a manuscript that is 423 pages long? (Print on one side only.) ?
A. 915,850 B. 775,850 C. 626,650 D. 423 E. 444,150
Write the first five terms of the arithmetic sequence.an = an - 1 - 
; a1 = - 
A. - 
, - 
, 
, 
, 
B. - 
, - 
, - 
, - 
, - 
C. - 
, - 
, - 1, - 
, - 
D. - 
, - 1, - 
, - 2, - 