Solve the problem.A zoom lens in a camera makes a rectangular image on the film that is 5 cm × 3 cm. As the lens zooms in and out, the size of the image changes. Find the rate at which the area of the image begins to change (dA/df) if the length of the frame changes at 0.8cm/s and the width of the frame changes at 0.4 cm/s.
A. 
m2/2
B. 5.2 m2/s
C. 4.4 m2/s
D. 1.4667 m2/s
Answer: C
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Determine whether or not the given equation is linear.8t2 + 8v = 77
A. Yes B. No
Determine the value of the trigonometric function of ? using the given information.If csc ? = 
and sec ? = 
, then determine the value of cot ?.
A. 
B. 
C. 
D. 
Solve the problem.After being struck with a hammer, a gong vibrates 21 vibrations in the first second and in each second thereafter makes 
as many vibrations as in the previous second. Find how many vibrations the gong makes before it stops vibrating.
A. 28 vibrations B. 23 vibrations C. 94 vibrations D. 84 vibrations
The graph of a trigonometric function of the form y = A sin (Bx) or y = A cos (Bx) for B > 0 is given. Determine the equation of the function represented by the graph.
A. y = 4 cos 
x
B. y = 2 cos 
x
C. y = 2 cos 4x
D. y = 4 cos 2x