Find the vertices of the hyperbola.9x2 - 36y2 + 18x + 144y - 459 = 0
A. (1, 1) and (1, -5)
B. (-7, 2) and (5, 2)
C. (-1, 5) and (-1, -1)
D. (-5, -2) and (7, -2)
Answer: B
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Solve the given applied problems involving variation.The pitch P of a musical tone varies inversely as its wavelength W. One tone has a pitch of 479 vibrations per second and a wavelength of 8.8 ft. Find the wavelength of another tone that has a pitch of 492 vibrations per second.
A. 0.000037 ft B. 0.12 ft C. 26,780.5 ft D. 8.6 ft
Graph the inequality.y < - 
x
A. 
B. 
C. 
D. 
Solve the problem.A breed of cattle needs at least 10 protein and 8 fat units per day. Feed type I provides 6 protein and 2 fat units at $4 per bag. Feed type II provides 2 protein and 3 fat units at $3 per bag. What mixture of Feed type I and Feed type II will fill the dietary needs at minimum cost?
A. 0 bags of Feed type I, 5 bags of Feed type II B. 1 bag of Feed type I, 1 bag of Feed type II C. 1 bag of Feed type I, 2 bags of Feed type II D. 4 bags of Feed type I, 0 bags of Feed type II
Solve.A boat goes 320 miles downstream in the same time it can go 240 miles upstream. The speed of the current is 9 miles per hour. Find the speed of the boat in still water.
A. 54 mph B. 72 mph C. 56 mph D. 63 mph