Solve the system by substitution.x2 + y2 = 113x - y = 1
A. (-8, -7), (-7, -8)
B. (8, -7), (7, -8)
C. (-8, 7), (-7, 8)
D. (8, 7), (-7, -8)
Answer: D
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Find the volume of the described solid.The solid lies between planes perpendicular to the x-axis at x = - 4 and x = 4. The cross sections perpendicular to the x-axis are circular disks whose diameters run from the parabola y = x2 to the parabola y = 32 - x2.
A. 
?
B. 
?
C. 
?
D. 
?
Subtract by borrowing as necessary.61 - 57
A. 14 B. 118 C. 4 D. 2
Use synthetic division to divide the first polynomial by the second.-2x3 - 16x2 - 32x - 10
x + 5
A. 2x2 - 5x - 2
B. 2x2 + 5x + 2
C. - 
x2 - 
x - 
D. -2x2 - 6x - 2
The annual sales (in billions of dollars) of global positioning systems (GPS) equipment from 2000 through 2006 follow (sales in 2004 through 2006 are projections). Here, 
corresponds to 2000.
Year, x0123456Annual sales, y7.28.71013.316.920.721.8?
Find an equation of the least-squares line for these data. Please round coefficients to the nearest hundredth if necessary. Use the equation found to estimate the annual sales of GPS equipment for 2005.
?
A. $19.43 billion B. $16.43 billion C. $15.66 billion D. $22.52 billion E. $15.86 billion