Select the graph that represents the given equation.x + 2y - z = 4
A. 
B. 
C. 
D. 
Answer: B
Mathematics
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Solve the compound inequality. Graph the solution set and write the solution in interval notation.x ? 1 and x ? -2
A. (-?, -2] ? [1, ?)
B. (-?, -2]
C. [-2, ?)
D. [-2, 1]
Mathematics
Write the complex number in rectangular form.6(cos 330° + i sin 330°)
A. -3
+ 3i
B. 3
- 3i
C. -3
- 3i
D. 3
+ 3i
Mathematics
Determine the continuity of the function at the given points.f(x) = 
at x = 1 and x = 3
A. The function f is continuous at neither 
nor 
B. The function f is continuous at 
but not at 
C. The function f is continuous at 
but not at 
D. The function f is continuous at both 
and 
Mathematics
Simplify.
A. - 
B. -6
C. 
D. 6
Mathematics