Write the rational expression in lowest terms.
A. 
B. 
C. 
D. 
Answer: B
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Find all the second order partial derivatives of the given function.f(x, y) = cos (xy2)
A. 
= - y2 sin xy2; 
= 2[ sin (xy2)- 2y2 cos (xy2)] ; 
= 
= 2y [sin (xy2)-y2 cos (xy2)]
B. 
= -y4 cos xy2; 
= - 2x[2xy2 cos (xy2) + sin(xy2)]; 
= 
=
- 2y[xy2 cos (xy2) + sin(xy2)];
C. 
= y2 sin xy2; 
= 2[2y2 cos (xy2) - sin (xy2)] ; 
= 
= 2y[y2 cos (xy2) - sin (xy2)]
D. 
= - y2 sin xy2; 
= 2y
; 
= 
= 2
Solve.A domed ceiling is a parabolic surface. For the best lighting on the floor, a light source is to be placed at the focus of the surface. If 3 m down from the top of the dome the ceiling is 15 m wide, find the best location for the light source.
A. 9.4 m down from the top B. 18.8 m down from the top C. 4.7 m down from the top D. 14.1 m down from the top
Find the value of x. Assume all angle measures are given in degrees.
A. 31° B. 30° C. 32° D. 29°
Find the measure of the angle.
?EGA
A. 145° B. 135° C. 140° D. 130°