Solve.The concentration of a certain gas molecule in the atmosphere serves as an indicator of industrial air pollution. The data in the following table show the relationship of the estimated concentration of the molecule in the atmosphere, in parts per billion (ppb), to the year.
Determine the linear, quadratic, or cubic function that best fits the data.
A. f(x) = 0.00001x3 - 0.003x2 + 0.14x + 2.16
B. f(x) = -0.003x2 + 0.12x + 2.19
C. f(x) = 0.002x + 2.90
D. f(x) = -0.002x2 + 0.12x + 2.19
Answer: A
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Solve the problem.The elasticity ? of a particular thermoplastic can be modeled approximately by the relation 
, where T is the Kelvin temperature. If the thermometer used to measure T is accurate to 1%, and if the measured temperature is 473 K, how should the elasticity be reported?
A. ? = ± 0.004 B. ? = 0.176 ± 0.002 C. ? = 0.176 ± 0.004 D. ? = 0.176
Graph the parabola described.Focus at (0, 3); Directrix the line y = -3
A. 
B. 
C. 
D. 
Find the trigonometric function value of angle ?.tan ? = - 
and ? in quadrant IIFind cos ?.
A. - 
B. - 
C. 
D. 
Rewrite f(x) = (ax + b)/(x + c) in f(x) = a + d/(x + c) form.f(x) = 
A. f(x) = 1 - 
B. f(x) = 1 + 
C. f(x) = 1 - 
D. f(x) = 1 + 