Find the vertex, the focus, and the directrix of the parabola.x2 + 2x - 8y - 39 = 0
A. Vertex: 
; Focus: (-1, -7); Directrix: y = -3
B. Vertex: 
; Focus: (-1, 3); Directrix: y = 13
C. Vertex: 
; Focus: (-1, -3); Directrix: y = -7
D. Vertex: 
; Focus: (-1, 3); Directrix: y = - 
Answer: C
Mathematics
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Solve.Write the equivalent decimal and fraction for 83
%.
A. 0.8
; 83
B. 0.08
; 
C. 0.008
; 
D. 0.8
; 
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Simplify.
A. 
B. 
C. 
D. 
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In a certain college, 33% of the physics majors belong to ethnic minorities. Find the probability of the event from a random sample of 10 students who are physics majors.Two or less belong to an ethnic minority.
A. 0.3070 B. 0.1080 C. 0.2888 D. 0.1990
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Find the value of the expression.-|-20|
A. 
B. 0
C. -20
D. 20
Mathematics