Solve.It is estimated that y, the number of items of a particular commodity (in millions) sold in the United States in year x, where x represents the number of years since 2000, is given by the formula 
That is, 
represents 2000, 
represents 2001, and so on. According to the formula, how many items sold in 2009?
A. 2.82 million items
B. 21.82 million items
C. 42.48 million items
D. 19.92 million items
Answer: D
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Provide an appropriate response.The error formula for Simpson's Rule depends upon i) f(x). ii) f''(x). iii) f(4) (x)iv) the number of steps
A. i, iii, and iv B. ii and iv C. iii and iv D. i and iii
Solve the problem.From a point on a straight road, two cars are driven in opposite directions, one at 71 miles per hour and the other at 54 miles per hour. In how many hours will they be 375 miles apart?
A. 3 hours B. Not enough information C. 2 hours D. 4 hours
Construct a stem and leaf display for given data.The instructor of an introductory mathematics class has recorded the number of students attending his class in the last 4 weeks. Below are his recordings.
A. 
B. 
C. 
D. 
Solve the system by the substitution method.
A. (24, 7), (24, -7) B. (-25, 0), (24, 7), (24, -7) C. (-25, 0), (24, 49), (24, -49) D. ?