?Suppose the sales S (in billions of dollars per year) for Proctor & Gamble for the years 1997 through 2002 can be modeled by 
, 
where t represents the year. During which year were the sales increasing at the lowest rate?
?
A. ?Sales are increasing at the lowest rate in the year 2002.
B. ?Sales are increasing at the lowest rate in the year 1997.
C. ?Sales are increasing at the lowest rate in the year 1998.
D. ?Sales are increasing at the lowest rate in the year 2000.
E. ?Sales are increasing at the lowest rate in the year 1999.
Answer: C
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Find the exact value of the following expression without using a calculator.cot 45°
A. 
B. 1
C. 
D. 
Find the real solutions of the equation.(5x + 2)1/3 = 4
A. {
}
B. {
}
C. {
}
D. {
}
Rotate the axes so that the new equation contains no xy-term. Discuss the new equation.x2 + 2xy + y2 - 8x + 8y = 0
A. ? = 36.9°
+ 
= 1
ellipse
center (0, 0)
major axis is x'-axis
vertices at (±2, 0)
B. ? = 45°
y'2 = -4
x'
parabola
vertex at (0, 0)
focus at (-
, 0)
C. ? = 45°
x'2 = -4
y'
parabola
vertex at (0, 0)
focus at (0, -
)
D. ? = 36.9°
+ 
= 1
ellipse
center (0, 0)
major axis is x'-axis
vertices at (±2, 0)
Solve the problem.A contestant in a 30-mile race finished in 4 hours. What was her average rate during the race? Use the formula d = rt. (Round to the nearest tenth, if necessary.)
A. 7.5 mph B. 26 mph C. 120 mph D. 0.1 mph