Add.
A. 4127
B. 4217
C. 5307
D. 4227
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.D = {(x, y) : 2 < 
+ 
< 4}
A. 
The boundary is the square with vertices
(-4, 0), (0, 4), (4, 0), and (0, -4). The interior
is the set of all points in the region inside
the boundary square. The set is open.
B. 
The boundary is the square with vertices
(-2, 0), (0, 2), (2, 0), and (0, -2). The interior
is the set of all points inside the boundary
square. The set is open.
C. 
The boundaries are squares. The first has
vertices (-2, 0), (0, 2), (2, 0), and (0, -2)
and the second has vertices (-4, 0), (0, 4),
(4, 0), and (0, -4). The set is open.
D. 
The boundaries are squares. The first has
vertices (-2, 0), (0, 2), (2, 0), and (0, -2)
and the second has vertices (-4, 0), (0, 4),
(4, 0), and (0, -4). The set is closed.
Determine the principal value without using a calculator.
A. 12 B. 72 C. 13 D. Not a real number
Determine whether the statement is true or false.sin 60° = 2 sin 30°
A. True B. False
Simplify the polynomial by combining like terms.x - x2 + 6 + 3 - 2x2 + x3
A. x3 - 3x2 + 9x B. x3 + 3x2 + x + 9 C. x3 - 3x2 + x + 9 D. x3 - 1x2 + x - 9