Find the exact value of y, or state that y is undefined.y = cot-1 
A. 
B. 
C. 0
D. 
Answer: A
Mathematics
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Use the fundamental identities to simplify the expression.1 - cos2 ?
A. sin ? B. - sin2 ? C. tan2 ? D. sin2 ?
Mathematics
Solve.x3 + 2x2 - 4x ? 8
A. [2, ?) B. [-2, 2] C. (-?, 2] D. (-?, -2] ? [2, ?)
Mathematics
Solve the inequality and graph the solution set.| x - 1 | ? 6
A. [-5, ?)
B. [7, ?)
C. [-5, 7]
D. (-?, -5] ? [7, ?)
Mathematics
Solve the problem.If x is the hydrogen ion concentration of a sample of water, then the pH of that water sample is 
If the pH of the water from one lake is 5.0 and the pH of the water from a second lake is 5.4, how many times greater is the hydrogen ion concentration of the second lake than the hydrogen ion concentration of the first lake? Round your answer to the nearest hundredth.
A. 8.43 B. 0.40 C. 2.51 D. 12.02
Mathematics