Solve the system by substitution. If the system is inconsistent or dependent, say so.
A. (1, 4)
B. (-1, -4)
C. (-1, 4)
D. (1, -4)
Answer: D
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Government economists of a developing country determined that the purchase of imported perfume is related to a proposed "luxury tax" by the formula 
, 
, where N(x) measures the percentage of normal consumption of perfume when a "luxury tax" of x% is imposed on it. Find the rate of change of N(x)
for a tax of 70%.
?
A. ?
B. ?
C. ?
D. 
Draw the graph of the equation.3x2 + 4y2 - 18x + 40y + 115 = 0
A. 
B. 
C. 
D. 
An object moves in simple harmonic motion described by the given equation, where t is measured in seconds and d in meters . Find the maximum displacement, the frequency, and the time required for one cycle.d = 6 + 4 cos 3?t meters
A. displacement = 4 meters; period = 
seconds; f = 
oscillations/second
B. displacement = 10 meters; period = 
seconds; f = 
oscillations/second
C. displacement = 4 meters; period = 
seconds; f = 
oscillations/second
D. displacement = 10 meters; period = 
? seconds; f = 
oscillations/second
Multiply.(8 + m)(8 - m)
A. 16 - m2 B. 64 + 16m - m2 C. 64 - m2 D. 64 - 16m - m2