The following table shows federal expenditures M, in billions of dollars, on national defense t years after 2004.
t 0 2 3 4 M 455.76 495.88 521.23 551.68A: Find the equation of the regression line.B: Plot the data along with the regression line.C: Explain in practical terms the meaning of the slope of the regression equation.D: What expenditure does the regression line predict for 2012?
What will be an ideal response?
A: 
?
B:?
?
?
C: During the period from 2004 to 2007, national defense expenditures increased by about 23.65 billion dollars each year.
?
D: 642.13 billion dollars
Mathematics
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for the volume of the tetrahedron cut from the first octant by the plane 
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Mathematics
An arithmetic sequence is given. Find the common difference and write out the first four terms.
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Evaluate the determinant.
A. 97 B. 65 C. 0 D. - 97
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Perform the indicated operation and simplify.
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Mathematics