Solve the problem.The total individual income tax collected by the tax collecting body of a country is a function of the number of people working, their income, and the tax rates. It has increased each year since 1970. The table below shows the individual income tax collected (in billions) for the time period between 1970 and 1995. Between 1980 and 1990, the average rate of change in the amount of tax collected is $25.7 billion per year. Interpret this average rate of change. 
A. Between 1980 and 1990, the amount of tax collected increased at a rate of $25.7 billion per year.
B. Between 1980 and 1990, the amount of tax collected increased by $25.7 billion.
C. In each year between 1980 and 1990, the amount of tax collected increased by $25.7 billion.
D. Between 1980 and 1990, the amount of tax collected decreased at a rate of $25.7 billion per year.
Answer: A
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Find the area of the surface generated when the given curve is revolved about the y-axis.y = 
, for 6 ? x ? 8
A. 
(173/2 - 103/2)
B. 4?(173/2 - 103/2)
C. 
(93/2 - 83/2)
D. 
(173/2 - 103/2)
Evaluate.i23 ? i11
A. i B. -i C. 1 D. -1
Solve the equation.
= 
A. {- 
, 
}
B. 
C. ?
D. {
, - 
}
Fill in the blank with one of the words or phrases listed below. 
An angle whose measure is between 90° and 180° is called a(n) 
angle.
A. adjacent B. angle C. obtuse D. acute