Graph the quadratic function. Identify the vertex and x-intercepts.y = x2 + 2x - 8
A. Vertex: (1, - 9);
x-intercepts: (-2, 0) and (4, 0)
B. Vertex: (- 1, - 9);
x-intercepts: (4, 0) and (2, 0)
C. Vertex: (1, - 9);
x-intercepts: (-2, 0) and (4, 0)
D. Vertex: (- 1, - 9);
x-intercepts: (-4, 0) and (2, 0)
Answer: D
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Solve the problem.From a distance of x feet to a 120-meter-high radio tower, the angle of elevation is ? degrees. Then 
Use a reciprocal identity to rewrite this formula.
A. 120 sec ?
B. 120 cot ?
C. 
D. 
Find the dimension of the matrix.
A. 3 × 3 B. 3 × 0 C. -7 D. 9
Solve the inequality by using algebraic and graphical methods. Round to three decimal places, if necessary.(x - 4)3 < 108
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