Use Descartes' Rule of Signs to determine the possible number of positive real zeros and the possible number of negative real zeros for the function.f(x) = 7x8 + 3x6 + 2x4 + 5x2 + 2
A. 
B. 
C. 
D. 
Answer: C
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Provide an appropriate response.The life expectancy (in hours) of a fluorescent tube is normally distributed with mean 7,000 and standard deviation 1,000. Find the probability that a tube lasts for more than 8,900 hours.
A. 0.0281 B. 0.9719 C. 0.0287 D. 0.9713
Solve the polynomial equation graphically or numerically. Round to the nearest hundredth if necessary.6x3 + 16x2 + 6x - 4 = 0
A. - 
, - 2, 
B. - 1, 
, 2
C. - 1, - 2, 
D. 
, 
, - 2
Solve the problem.A cross-section of an irrigation canal is a parabola. If the surface of the water is 37 ft wide and the canal is 37 ft deep at the center, how deep is it 13 ft from the edge?
A. 33.7 ft B. 3.3 ft C. 15.6 ft D. 21.4 ft
Use a double-angle identity to find the exact value of the expression.2 cos2 
- 1
A. - 
B. - 
C. 
D. 