Find the exact value of the expression.
A. - 
B. - 
C. -2
D. -
Answer: D
Mathematics
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Solve the problem.Approximately 4 × 103 employees of a certain company average $30,000 each year in salary. Write the total amount earned by all the employees of this company per year in scientific notation.
A. $1.2 × 109 B. $1.2 × 108 C. $12 × 109 D. $12 × 108
Mathematics
Factor the polynomial by grouping.6x2 - 10x + 9x - 15
A. (6x - 3)(x + 5) B. (6x + 3)(x - 5) C. (2x - 3)(3x + 5) D. (2x + 3)(3x - 5)
Mathematics
Solve the system using the matrix inverse method.-4x + y - 3z - w = -4-x + 3y + z - 4w = -153x - 3y - 4z + w = 4-3x - y - z - 4w = -3
A. {(-1, 3, -1, -2)} B. {(-1, -3, 1, 2)} C. ? D. {(1, -1, 3, 4)}
Mathematics
Solve by elimination and check.x + y = -8x - y = 4
A. (2, -5) B. (-3, -5) C. No solution D. (-2, -6)
Mathematics