Find the equation of the parabola described.Vertex at (3, -1); focus at (8, -1)
A. (x + 3)2 = 28(y - 1)
B. (x + 3)2 = -28(y - 1)
C. (y + 1)2 = -20(x - 3)
D. (y + 1)2 = 20(x - 3)
Answer: D
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Find the equation of the least-squares regression line. Graph the line and data points on the same graph.
A. y = 2.8x
B. y = 3.0x
C. y = 0.15 + 3.0x
D. y = 0.15 + 2.8x
Find the center of mass (in cm) of the particles with the given masses located at the given points on the x-axis.17 g at (4.9, 0), 23 g at (-9.8, 0), 31 g at (2.5, 0), 44 g at (-8.2, 0)
A. -3.7 cm B. 40 cm C. 0.91 cm D. -11 cm
Solve the problem.The profit (in millions of dollars) for Allied Manufacturing can be approximated by 
where x is the year 1989 ? x ? 2009. Approximate the average rate of change over a 4-year period. Round your answer to three decimal places when appropriate.
A. 3.254 million dollars B. 2.814 million dollars C. 0.744 million dollars D. 1.244 million dollars
Perform the indicated operation. Write the result in the form a + bi.
? 
A. -21i B. -21 C. 21 D. 21i2