Solve the equation for ? if 
.
?
?
A. 30°, 90°
B. 30°, 330°
C. 210°, 270°
D. 0°, 60°
E. 150°, 210°
Answer: C
Mathematics
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Find the missing length(s) in the right triangle. If necessary, round to the nearest tenth.
A. a = 7 cm; b = 12.1 cm B. a = 12.1 cm; b = 7 cm C. a = 7 cm; b = 147 cm D. a = 12.1 cm; b = 10.5 cm
Mathematics
The matrix is the final matrix form for a system of two linear equations in variables x1 and x2. Write the Solution of the system.
A. x1 = 3 x2 = 5 B. x1 = -5 x2 = -3 C. x1 = 5 x2 = t for any real number t D. x1 = 5 x2 = 3
Mathematics
Determine whether the matrix is in row-echelon form. If it is, then determine also whether it is in reduced row-echelon form.
A. Yes; yes B. Yes; no C. No
Mathematics
Use the multiplication principle to solve the equation.-6x = -42
A. 2 B. -36 C. 36 D. 7
Mathematics