Use logarithmic differentiation to find the derivative of y.y = 
A. 
B. 
C. 
(2x - 5)
D. 
Answer: D
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Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = 
A. Domain: all points in the xy-plane; range: real numbers z ? 0; level curves: parabolas 
B. Domain: all points in the xy-plane excluding x = 0; range: all real numbers; level curves: parabolas 
C. Domain: all points in the xy-plane excluding x = 0; range: real numbers z ? 0; level curves: parabolas 
D. Domain: all points in the xy-plane; range: all real numbers; level curves: parabolas 
Solve the problem. Round your answer, if appropriate.As the zoom lens in a camera moves in and out, the size of the rectangular image changes. Assume that the current image is 8 cm × 5 cm. Find the rate at which the area of the image is changing (dA/df) if the length of the image is changing at 0.7 cm/s and the width of the image is changing at 0.3 cm/s.
A. 11.8 cm2/sec B. 5.9 cm2/sec C. 14.2 cm2/sec D. 7.1 cm2/sec
Simplify the following expression. –(x+9)
A) -x + 9 B) -x – 9 C) x + 9 D) x – 9 E) 9
Find an equation of the line having the given slope and containing the given point. m = - 
, (3, 4)
A. y = - 
x + 
B. y = - 
x - 
C. y = - 
x + 
D. y = - 
x - 