Give all possible rational zeros for the polynomial.f(x) = -2x4 + 4x3 + 5x2 + 18
A. ±1, ±2, ± 
, ± 
, ± 
, ± 
, ± 
B. ±1, ± 
, ±2, ±3, ±6, ±9, ±18
C. ±1, ±2, ±3, ±6, ±9, ±18
D. ±1, ± 
, ±2, ±3, ± 
, ±6, ±9, ± 
, ±18
Answer: D
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Solve the problem.If a resistor and inductor are connected in series to a battery of emf ?, the current in the circuit is given by 
where ? is the time constant of the circuit, R is the resistance, and t is the time since the circuit was closed. Find the expression for dI/dt.
A. - 
et/?
B. 
e-t/?
C. 
e-t/?
D. 
Solve the equation by making an appropriate substitution.2x1/2 - 3x1/4 - 20 = 0
A. 
B. {256}
C. {-4, -5}
D. 
Factor completely.x2 - x - 30
A. Prime B. (x + 6)(x - 5) C. (x + 1)(x - 30) D. (x + 5)(x - 6)
Solve the problem.Researchers conducted a weight loss study of moderately overweight women. In addition to dieting, the women kept exercise and weight loss journals for one year. The researchers used this data to derive a polynomial function that models average monthly weight loss as a function of average weekly minutes of aerobic exercise. As its coefficients make the function difficult to compute by hand, the graph below was used in estimating.
Use the graph to estimate a women's average monthly weight loss if she exercised an average of 45 minutes per week.
A. 1.1 lb B. 2.1 lb C. 2.6 lb D. 1.5 lb