Simplify the expression.-(-9x)
A. -9x
B. 9
C. 9x
D. -9
Answer: C
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Combine the complex numbers.(3 + 7i) - (-5 + i)
A. 8 + 6i B. 8 - 6i C. -8 - 6i D. -2 + 8i
Refer to this figure to answer the question. Assume 
and 
are parallel.
What is the vertex of ?DEI?
A. I B. E C. D
Use the determinant feature of a graphing calculator to solve the system by Cramer's rule . (Round to one decimal place.)2.7x - 2.1y + 4.0z = 3.14.1x - 7.0y + 0.2z = -5.04.1x - 2.5y + 3.3z = 7.1
A. {(28.6, 22.4, -1.3)} B. {(3.6, 2.8, -0.2)} C. {(7.1, 5.6, -0.3)} D. {(14.3, 11.2, -0.7)}
The given measurements may or may not determine a triangle. If not, then state that no triangle is formed. If a triangle is formed, then use the Law of Sines to solve the triangle, if it is possible, or state that the Law of Sines cannot be used.
A. B = 33°, a ? 53.6, b ? 15.6 B. B = 57°, a ? 53.6, b ? 15.6 C. B = 57°, a ? 6, b ? 15.6 D. The triangle cannot be solved with the Law of Sines.