Write a numerical expression for the phrase and simplify it.Four-ninths of the difference between -9 and -27.
A. 4(9) [(-9) - (-27)]; 8
B. 
[(-9) - (-27)]; 8
C. 
+ [(-9) - (-27)]; 24
D. 4(9) [(-9) - (-27)]; 648
Answer: B
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Find all the second order partial derivatives of the given function.f(x, y) = cos xy2
A. fxx(x, y) = y2 sin xy2; fyy(x, y) = 2[2y2 cos (xy2) - sin (xy2)] ; fyx(x, y) = fxy(x, y) = 2y[y2 cos (xy2) - sin (xy2)]
B. fxx(x, y) = -y4 cos xy2; fyy(x, y) = - 2x[2xy2 cos (xy2) + sin (xy2)]; fyx(x, y) = fxy(x, y) = - 2y[xy2 cos (xy2) + sin (xy2)];
C. fxx(x, y) = - y2 sin xy2; fyy(x, y) = 2[ sin (xy2)- 2y2 cos (xy2)] ; fyx(x, y) = fxy(x, y) = 2y [sin (xy2)-y2 cos (xy2)]
D. fxx(x, y) = - y2 sin xy2; fyy(x, y) = 2y
; fyx(x, y) = fxy(x, y) = 2
Evaluate the improper integral.
A. 
B. 
C. 
D. 
Solve by graphing. Label the axes and show where the solution is located on the graph.Alison sets aside 
each month to spend on books and CDs. If she spends c dollars on CDs in a given month she may spend b dollars on books where 
Graph the equation and use the graph to estimate the amount Alison may spend on books in March if she spends 
on CDs.
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A. $47
B. $36
C. $43
D. $84
Use a vertical format to add the polynomials.1.1x3 + 7.3x2 + 4.5 6.1x - 2.9
A. 12.4x6 + 11.3 B. 1.1x3 + 10.4x2 + 5.1x - 8.1 C. 1.1x3 + 4.2x2 + 7.1x + 11.3 D. 1.1x3 + 4.2x2 + 6.1x + 11.3