Solve the problem.For the function f(x) = 6
- 6
, find all values x for which f(x) = -18.
A. -11
B. 4
C. 11
D. 18
Answer: B
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Factor the polynomial.81k3m - 375m4
A. 3m(3k - 5m)(9k2 + 15km + 25m2) B. 3m(3k + 5m2)(9k2 - 15km + 25km2) C. 3m(27k - 5m)(k2 + 15km + 25m2) D. (9km - 15m2)(9k2 + 25m2)
Graph the sinusoidal function.y = 
cos (- 
x)
A. 
B. 
C. 
D. 
Solve the logarithmic equation. Be sure to reject any value that is not in the domain of the original logarithmic expressions. Give the exact answer.log (2 + x) - log (x - 2) = log 3
A. {-4}
B. {4}
C. ?
D. 
In a particular area of the United States, the electric utility company has determined that the average monthly electric bill (in dollars) for homeowners varies with the average monthly temperature (degrees Fahrenheit) as shown in the table below. Average monthly temp.°F Average monthly electric bill$ 40 78 60 61 80 108 Find a least squares regression parabola that models the data and use that to estimate the average monthly electric bill in a month with average temperature of 57 oF.
A. y = 0.07(57)2- 7.85(57) + 304 = $84 B. y = 0.06(57)2- 6.85(57) + 304 = $108 C. y = 0.07(57)2- 5.85(57) + 304 = $198 D. y = 0.08(57)2- 8.85(57) + 304 = $59 E. y = 0.08(57)2- 4.85(57) + 304 = $287