Solve the problem.Find an equation for the level surface of the function f(x, y, z) = 
d? - 
dt that passes through the point (0, ln 9, ln 3) .
A. ey + ez - 
= -6
B. ey + ez - 
= 6
C. ey - ez + 
= 6
D. ey - ez + 
= -6
Answer: C
Mathematics
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A. Exact B. Approximate
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Simplify the given expression. Expansion of any term is not necessary; proper recognition of the form of the expression leads to the proper result.
A. 6 tan 6x B. 3 tan 6x C. 3 tan 3x D. tan 6x
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Graph.36x2 - 9y2 - 216x - 90y - 225 = 0
A. 
B. 
C. 
D. 
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Solve.Jan swims at a speed of 5.2 mph in still water. The river she's in flows at a speed of 3.1 mph. How long will it take Jan to swim 2.5 mi downstream? Round your answer to the nearest tenth of an hour, if necessary.
A. 0.3 hr B. 20.8 hr C. 3.3 hr D. 1.2 hr
Mathematics