Divide. Express your answer in standard form.
A. 
+ 
i
B. 
- 
i
C. - 
- 
i
D. - 
+ 
i
Answer: D
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Sketch the indicated set. Describe the boundary of the set. Finally, state whether the set is open, closed or neither.{(x, y) : -2 ? x ? 0, 0 ? y ? 2 + x}
A. 
The boundary is the triangle with vertices
(0, 0), (-2, 0), (0, -2). The set is open.
B. 
The boundary is the triangle with vertices
(0, 0), (2, 0), (0, 2). The set is open.
C. 
The boundary is the triangle with vertices
(0, 0), (2, 0), (0, 2). The set is closed.
D. 
The boundary is the triangle with vertices
(0, 0), (-2, 0), (0, 2). The set is closed.
Solve the given differential equation.
+ 5
+ 4y = xex + 7
A. y = c1e-4x + c2e-x - 
ex - 
xex + 
B. y = c1e-4x + c2e-x - 
ex + 
xex + 
C. y = c1e-4x + c2e-x + 
ex - 
xex + 
D. y = c1e-4x + c2e-x + 
ex + 
xex + 
Decide whether the figure shown is a polyhedron.
A. Polyhedron B. Not a polyhedron
Solve the problem. Round your answer to the nearest tenth unless indicated otherwise.In a certain medium, sound travels at a speed of 7929 feet per second. How many meters per second does sound travel in this medium? Round to the nearest tenth.
A. 7215.4 m/s B. 26,007.1 m/s C. 3092.3 m/s D. 2378.7 m/s