Solve the problem.A flare fired from the bottom of a gorge is visible only when the flare is above the rim. If it is fired with an initial velocity of 144 ft/sec, and the gorge is 224 ft deep, during what interval can the flare be seen?(h = -16t2 + vot + ho.)
A. 0 < t < 2
B. 2 < t < 7
C. 4 < t < 9
D. 6 < t < 11
Answer: B
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Find the unit tangent vector T and the principal unit normal vector N. r(t) = (cosh t)i + (sinh t)j + tk
A. T = - 
(tanh t sech t)i + 
j + 
(sech t)k; N = (-sech t)i - (tanh t)k
B. T = 
(tanh t sech t)i + 
j + 
(sech t)k; N = (sech2 t)i - (sinh t)k
C. T = - 
(tanh t)i + 
j + 
(sech t)k; N = (-sech t)i - (sinh t)k
D. T = 
(tanh t)i + 
j + 
(sech t)k; N = (sech t)i - (tanh t)k
Solve the problem.The data below gives the eye colors of 20 students in a Statistics class. Make a frequency table for the data. 
A. 
B. 
C. 
D. 
E. 
Find the real or imaginary solutions by completing the square.2x2 - 4x - 6 = 0
A. 
B. 
C. 
D. 
Use the graph to find the intervals on which it is increasing, decreasing, or constant.
A. Decreasing on (-?, ?) B. Decreasing on (-?, 0); increasing on (0, ?) C. Increasing on (-?, ?) D. Increasing on (-?, 0); decreasing on (0, ?)