Find the center (h, k) and radius r of the circle. Graph the circle.x2 + y2 + 2x + 4y + 1 = 0
A. Center (-1, -2), r = 2
B. Center (1, 2), r = 2
C. Center (-1, 2), r = 2
D. Center (1, -2), r = 2
Answer: A
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A. - 4860 B. 0 C. 1350 D. - 4050
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are applied to a circuit, 
of current flow through the circuit. Find the new current if the voltage is increased to 
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