Solve the equation by using the quadratic formula.x2 + 16x + 47 = 0
A. {8 - 
, 8 + 
}
B. {8 + 
}
C. {-16 + 
}
D. {-8 - 
, -8 + 
}
Answer: D
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Solve the problem.The following table shows the median number of hours of leisure time that Americans had each week in various years.
(i) Use a graphing calculator to fit a quadratic sequence regression function an = an2 + bn + c to the data, where n is the number of years after 1973. (ii) Estimate the median number of leisure hours per week in 2000 and 2010. Round to the nearest hour.
A. (i) an = -0.04x2 + 1.21x + 26.03; (ii) 30 hours; 16 hours B. (i) an = 0.04n2 - 1.21n + 26.03; (ii) 23 hours; 36 hours C. (i) an = -0.021n2 + 1.44n + 28.07; (ii) 52 hours; 53 hours D. (i) an = 0.021x2 - 1.44x + 28.07; (ii) 4 hours; 4 hours
Using your knowledge of special right triangles, find the length of each leg. Round to the nearest tenth.
A. 50 in., 24 in. B. 25 in., 24.5 in. C. 12.5 in. , 25.2 in. D. 12.5 in., 21.7 in.
State the domain of the rational function.f(x) = 
A. (-?, ?) B. (-?, -5) ? (-5, ?) C. (-?, 5) ? (5, ?) D. (-?, - 3) ? (- 3, 3) ? (3, ?)
Convert the units.0.98 g = 
mg
A. 0.00098 mg B. 980 mg C. 0.0098 mg D. 98 mg