Find the focus and the directrix of the parabola.y2 - 4x - 8y + 4 = 0
A. Focus: (-4, 4); directrix: x = -2
B. Focus: (-2, 4); directrix: x = -4
C. Focus: (-4, -3); directrix: y = -2
D. Focus: (1, -3); directrix: y = 7
Answer: B
Mathematics
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A. ?
B. 0
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D. 
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.
A. 7x + 4y + 5z = -59 B. 7x + 4y + 5z = 7 C. 7x + 4y + 5z = 16 D. 7x + 4y + 5z = 59
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A. Invalid B. Valid
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Decide whether the expression has been simplified correctly.60x = 0
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