Find the vertex, focus, and directrix of the parabola with the given equation.y2 - 14y - 4x + 61 = 0
A. vertex: (3, 7)
focus: (2, 7)
directrix: x = 4
B. vertex: (7, 3)
focus: (7, 4)
directrix: y = 2
C. vertex: (7, 3)
focus: (7, 2)
directrix: y = 4
D. vertex: (3, 7)
focus: (4, 7)
directrix: x = 2
Answer: D
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Solve.A domed ceiling is a parabolic surface. For the best lighting on the floor, a light source is to be placed at the focus of the surface. If 3 m down from the top of the dome the ceiling is 15 m wide, find the best location for the light source.
A. 9.4 m down from the top B. 18.8 m down from the top C. 4.7 m down from the top D. 14.1 m down from the top
Simplify.
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B. 
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Match the situation to the graph that models it best.The profit (revenue minus cost) from selling x items
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B. 
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D. 