Use Cramer's rule to solve the linear system.-4x - 9z = -439x + 8y - 5z = 935x - 4y = -16
A. (4, 9, 3)
B. (5, 7, 3)
C. (4, -9, -3)
D. (9, 3, 9)
Answer: A
Mathematics
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Find all solutions to the equation in [0°, 360°). 
cot ? = 1 - 
csc ?
A. {120°} B. {60°, 120°, 240°, 300°} C. {240°, 300°} D. No solution
Mathematics
Determine which fractions are proper.
, 
, 
, 
, 
A. 
, 
, 
B. 
, 
, 
, 
C. 
, 
, 
, 
, 
D. 
, 
Mathematics
Factor by grouping.xy + y + 7x + 7
A. (7x + 7)(y + 1) B. (x + 1)(7y + 7) C. (x + 7)(y + 1) D. (x + 1)(y + 7)
Mathematics
Solve the problem.One-half serving of soy sauce contains 431 milligrams of sodium. How many grams of sodium from soy sauce are included in an egg-foo-yung dish made from 4 servings of soy sauce? Round to the nearest tenth of a gram.
A. 0.1 g B. 3.4 g C. 172.4 g D. 107.8 g
Mathematics