Find the exact value of the expression using a sum or difference identity.cos 255°
A. 
(
- 1)
B. - 
C. - 
(
- 1)
D. 
Answer: B
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Write the inequality in interval notation.2 ? x < 6
A. (2, 6] B. [2, 6] C. [2, 6) D. (2, 6)
Write a system of equations for the problem, and then solve the system.Two trains start from towns 572miles apart and travel toward each other on parallel tracks. They pass each other 5.5 hours later. If one train travels 18 mph faster than the other, find the speed of each train.
A. 63 mph; 41 mph B. 61 mph; 43mph C. 51 mph; 53 mph D. 56 mph; 48 mph
Write the binomial expansion of the expression.(2x2 - y)5
A. - 32x10 + 80x8y - 80x6y2 + 40x4y3 - 10x2y4 + y5 B. 32x10 + 80x8y + 80x6y2 + 40x4y3 + 10x2y4 + y5 C. 32x10 - 80x8y + 80x6y2 - 40x4y3 + 10x2y4 - y5 D. 32x10 - 80x8y - 80x6y2 - 40x4y3 - 10x2y4 - y5
Solve the polynomial inequality. Express the solution in interval notation.x3 - 4x2 > 0
A. (4, ?) B. (-?, 0) ? (4, ?) C. (-?, 4) D. (0, 4)