Compute the gradient of the function at the given point.
A. ?f = 
i + 
j - 
k
B. ?f = - 
i + 
j - 
k
C. ?f = - 
i + 
j - 
k
D. ?f = 
i + 
j - 
k
Answer: D
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Solve the problem. Round to the nearest hundredth of a percent.Mary was offered a discount if she pays her invoice in 120 days. One bank will loan her money at 12% simple interest. A second bank will give her a simple discount rate. What discount rate should she accept so she does not pay more than at the first bank?
A. 12.5% B. 11.65% C. 10.58% D. 11.54%
Find the vertices and the foci of the given ellipse.
+ 
= 1
A. V: (-36, 0), (36, 0)
F: (-6, 0) and (6, 0)
B. V: (-6, 0), (6, 0);
F:(- 3
, 0), (3
, 0)
C. V: (0, -6), (0, 6);
F: (0, - 3
), (0, 3
)
D. V: (0, -9), (0, 9);
F: (0, -3) and (0, 3)
Show that the equation is not an identity by listing the value(s) of the variable from among 0, ?/4, ?/2, and - ?/4 for which the equation is false.sin ? = 
A. 
B. 0 and 
C. 
and - 
D. - 
Simplify the expression.(-b)2
A. Exponent: -2, base: b B. Exponent: -b, base: 2 C. Exponent: 2, base: b D. Exponent: 2, base: -b