Solve the problem.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.
Take 1985 as year zero, and determine the linear, quadratic, or cubic function that best fits the data.
A. f(x) = -0.002x2 + 0.12x + 2.19
B. f(x) = 0.002x + 2.90
C. f(x) = -0.003x2 + 0.12x + 2.19
D. f(x) = 0.00001x3 - 0.003x2 + 0.14x + 2.16
Answer: D
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Find the center of mass of a thin plate covering the given region with the given density function.The region bounded by the curves y = ± 
and the lines x = 1 and x = 9, with density ?(x) = 
A. 
= 5, 
= 0
B. 
= 4, 
= 0
C. 
= 2, 
= 0
D. 
= 3, 
= 0
?Which of the following does not expresses the area of the following rectangle?
?
W = 
?L = 
A.
?
B.
?
C.
?
D.
?A= 
x2 + 
x
E.
?Area is the sum of all square units with the rectangular region.
Provide an appropriate response.Use the calculator to find the approximate value of the root 211/2.
A. 4.582575695 B. 441 C. 2.140695143 D. 10.5
Find the reciprocal, or multiplicative inverse.- 
A. 1
B. 
C. - 
D. 