Find the center (h, k) and the radius r of the circle.x2 + y2 - 10x + 6y + 19 = 0
A. (h, k) = (5, -3), r = 
B. (h, k) = (-5, 3), r = 
C. (h, k) = (5, -3), r = 15
D. (h, k) = (-5, 3), r = 15
Answer: A
Mathematics
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A. 
B. 
C. 
D. 
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Write the number without exponents.6.894 × 10-5
A. 0.00006894 B. 0.0006894 C. -689,400 D. 0.000006894
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Write a quadratic equation in the form ax2 + bx + c = 0 that has the given numbers as solutions.5i, -5i
A. x2 - 10 - 25 = 0 B. x2 - 25 = 0 C. x2 + 25 = 0 D. x2 + 10 + 25 = 0
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Find the exact value by using a half-angle identity.sin 
A. 
B. - 
C. - 
D. 
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