Solve the equation by making an appropriate substitution.x-2 - 10x-1 + 9 = 0
A. {1, 9}
B. {-1, -9}
C. 
D. 
Answer: C
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Use the graph of the function f(x) to locate the local extrema and identify the intervals where the function is concave up and concave down.
A. Local minimum at x = 1; local maximum at x = -1; concave down on (-?, ?) B. Local minimum at x = 1; local maximum at x = -1; concave down on (0, ?); concave up on (-?, 0) C. Local minimum at x = 1; local maximum at x = -1; concave up on (0, ?); concave down on (-?, 0) D. Local minimum at x = 1; local maximum at x = -1; concave up on (-?, ?)
Solve the problem.The area of the rectangle is represented by y2 + 2y - 35. What is the length?
A. y + 5 B. y - 7 C. y + 7 D. y - 5
State whether the graph is or is not that of a function.
A. Yes B. No
Translate the sentence to an inequality.Three times a number less twenty-one must be more than thirty.
A. 3(x - 21) ? 30 B. 3(x - 21) > 30 C. 3x - 21 ? 30 D. 3x - 21 > 30