Solve the problem.Consider the following simplified digital photograph that has a 3 × 3 grid with four gray levels numbered from 0 to 3. It shows a letter Y in black on a light gray background.
Let A be the 3 × 3 matrix that represents this figure digitally. Find the matrix B for which B - A represents the negative image of the picture represented by A.
A. 
B. 
C. 
D. 
Answer: A
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Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = ln (5x + 9y)
A. Domain: all points in the xy-plane satisfying 5x + 9y ? 0; range: all real numbers; level curves: lines 
B. Domain: all points in the xy-plane satisfying 5x + 9y > 0; range: all real numbers; level curves: lines 
C. Domain: all points in the xy-plane; range: all real numbers; level curves: lines 
D. Domain: all points in the xy-plane satisfying 5x + 9y > 0; range: real numbers z ? 0; level curves: lines 
An observer for a radar station is located at the origin of a coordinate system. For the point given, find the bearing of an airplane located at that point. Express the bearing using both methods.(-8, -8)
A. 225°; S 45° E B. 225°; S 45° W C. 315°; N 45° W D. 315°; N 45° E
Graph the quadratic function. Determine the vertex and axis of symmetry.f(x) = (x + 4)2 + 6
A. vertex: (-6, 4 )
axis of symmetry: x = -6
B. vertex: (-4, 6)
axis of symmetry: x = -4
C. vertex: (6, -4)
axis of symmetry: x = 6
D. vertex: (4, 6)
axis of symmetry: x = 4
Divide.
A. y - 2
B. y2 + 2
C. y + 
D. y + 2