Determine the standard equation of the ellipse described.Foci at (0, 4) and (-4, 4); vertex at (-5, 4).
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Answer: C
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Establish the identity.sin
= 
(cos x + sin x)
What will be an ideal response?
Write a percent proportion that could be used to answer the question. Do not solve. What percent of 63 calories is 16 calories?
A. 
= 
B. 
= 
C. 
= 
D. 
= 
Find the angle 
between two nonvertical lines 
and 
. The angle
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?
?
where 
and 
are slopes of and , respectively.
(Assume that 
.)
?
?
?
Round your answer to one decimal place.
?
A. 54.1o
B. ?53.1o
C. 55.1o
D. 52.1o
E. 56.1o
Find the second-order partial derivative.Find 
, where f(x, y) = x4y5 + x5y.
A. 4x3y5 + 5x4y B. 12x2y5 + 20x3y C. 12x2y5 + 20x3 D. 20y3