Find an equation of the circle with the given center and radius.Center (-9, 0), radius 
A. x2 + (y + 9)2 = 9
B. (x + 9)2 + y2 = 3
C. x2 + (y - 9)2 = 9
D. (x - 9)2 + y2 = 3
Answer: B
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Integrate the function f over the given region.f(x, y) = xy over the triangular region with vertices (0, 0), (6, 0), and (0, 2)
A. 3
B. 6
C. 1
D. 
In the statement, fill in the first blank with either solid or dashed. Fill in the second blank with above or below.The boundary of the graph of y > -3x + 
will be a 
line, and the shading will be 
the line.
A. solid; below B. dashed; below C. dashed; above D. solid; above
Solve the problem.A police helicopter is monitoring the speed of two cars on a straight road. The helicopter is at an altitude of 
feet directly above the road. At one instant, the angle of elevation from the first car to the helicopter is 
and the angle of elevation from the second car to the helicopter is 
How far apart are the two cars to the nearest foot? Assume that both cars are in front of the helicopter.
A. 107 ft B. 2796 ft C. 328 ft D. 2645 ft
Show that the function 
is concave upward wherever it is defined.
What will be an ideal response?