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) = -9x4 + 3x3 - 2x2 + 8x - 8
A. 0 or 2 positive; 0, 2, or 4 negative
B. 0 or 2 positive; 0 or 2 negative
C. 0, 2, or 4 positive; 0 negative
D. 0, 2, or 4 positive; 0, 2, or 4 negative
Answer: C
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Provide an appropriate response.The equation -x2 = - 64 has no real solutions.
A. True. B. False; the equation is equivalent to x2 = 64 and has two real solutions, 8 and -8. C. False; the equation has one real solution, 8.
Prepare a probability distribution for the experiment. Let x represent the random variable, and let P represent the probability.Three coins are tossed, and the number of heads is noted.
A. 
B. 
C. 
D. 
Factor completely.18y2 + 81y - 45
A. 9(2y - 1)(y + 5) B. (18y - 9)(y + 5) C. (2y - 1)(9y + 45) D. 9(2y + 1)(y - 5)
Solve.By switching service providers, a family's telephone bill decreased from about $50 a month to about $43. What was the percent of decrease?
A. 16.3%
B. 14%
C.
| 7% |
D. 15%