Find the vertex, focus, and directrix of the parabola. Graph the parabola.x2 - 8x - 8y + 72 = 0
A. vertex: (4, 7); focus: (4, 5);
directrix: y = 9
B. vertex: (4, 7); focus: (4, 9);
directrix: y = 5
C. vertex: (4, 7); focus: (6, 7);
directrix: x = 2
D. vertex: (4, 7); focus: (2, 7);
directrix: x = 6
Answer: B
Mathematics
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Perform the indicated operation or operations.
+ 
A. 
B. 
C. 
D. 1
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Solve the equation. Round your answer to three decimal places.
x = 21
A. 4.392 B. -0.228 C. -4.392 D. -10.500
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Answer the question or complete the sentence to make a true statement.The sum of a negative number and 0 will always be a number.
A. Positive B. Negative
Mathematics
Solve.Find the distance d(P1, P2) between points P1 = (7, -5) and P2 = (3, -7).
A. 12
B. 2
C. 2
D. 12
Mathematics