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 1990, is given by the formula 
That is, 
represents 1990, 
represents 1991, and so on. According to the formula, how many items sold in 2000?
A. 20.72 millions
B. 51.20 millions
C. 19.16 millions
D. 3.56 millions
Answer: C
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Evaluate the definite integral.
A. 24.33 B. 14.67 C. 15.17 D. 14.5
Solve the problem.In how many ways can a group of 7 students be selected from 8 students?
A. 7 B. 1 C. 56 D. 8
Solve.If the force acting on an object stays the same, then the acceleration of the object is inversely proportional to its mass. If a force acts on an object with a mass of 30 kilograms so that it accelerates at 
per second per second, then find the acceleration of an object with a mass of 
that is acted on by the same force.
A. 45 meters per second per second B. 48 meters per second per second C. 54 meters per second per second D. 6 meters per second per second
Use properties of logarithms to condense the logarithmic expression. Write the expression as a single logarithm whose coefficient is 1. Where possible, evaluate logarithmic expressions.8 ln x - 
ln y
A. ln x8
B. ln 
C. ln x8y3
D. ln 