Solve the system.xy = 42x + y = 13
A. {(7, -6), (6, -7)}
B. {(-7, 6), (-6, 7)}
C. {(-7, -6), (-6, -7)}
D. {(7, 6), (6, 7)}
Answer: D
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Find 
by using the Chain Rule. Express your final answer in terms of t.w = ex cos y + ey cos x; x = 5t, y = -4t
A. e5t(5 cos -4t - 4 sin -4t) e-4t(-4 cos 5t + 5 sin 5t) B. e5t(5 cos -4t + 4 sin -4t) e-4t(-4 cos 5t - 5 sin 5t) C. e-4t(5 cos -4t - 4 sin -4t) e5t(-4 cos 5t + 5 sin 5t) D. e-4t(5 cos -4t + 4 sin -4t) e5t(-4 cos 5t - 5 sin 5t)
Find the vertex, axis of symmetry, and y-intercept of the parabola that has the given focus and directrix.Focus 
, directrix y = 
A. 
, x = - 
, 
B. 
, y = 4, (0, 4)
C. 
, x = - 
, 
D. (-6, 4), x = - 
, (0, 40)
Use the information in the graphs to determine the truth value of the compound statement. 
From Year 1 though Year 3, the percentage of science majors increased or the percentage of liberal arts majors increased, and those who where undecided did not decrease.
A. True B. False
Find all local extreme values of the given function and identify each as a local maximum, local minimum, or saddle point.
A. 
saddle point; 
saddle point
B. 
local maximum
C. 
local maximum; 
local minimum
D. 
local minimum; 
saddle point; 
saddle point; 
local maximum