Complete the square and write the equation in standard form. Then give the center and radius of the circle and graph the equation.x2 + y2 + 8x - 20 = 0
A. x2 + (y + 4)2 = 36
center (0, - 4), r = 6
B. (x + 4)2 + y2 = 36
center (- 4, 0), r = 6
C. (x - 4)2 + y2 = 36
center (4, 0), r = 6
D. x2 + (y - 4)2 = 36
center (0, 4), r = 6
Answer: B
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Evaluate 
when r = -1 and s = -2.
?
A. 14 B. -56 C. 38,416 D. -14 E. -112
For a satellite orbiting Earth, the time required to complete a single orbit is known as the period. The period P, in hours, is related to the distance D, in miles, from the center of Earth by the formula 
.
What happens to the distance as the period increases? A graph of D versus P can help you answer this question.
?
A. Distance increases as period increases. B. Distance decreases as period increases. C. Distance is at a maximum. D. Concavity changes as the period increases.
Find the y- and x-intercepts for the equation. Then graph the equation.4x - 16y = 16
A. (0, -1), (-4, 0)
B. (0, -1), (4, 0)
C. (0, -4), (1, 0)
D. (0, 4), (-1, 0)
Solve the system of equations.
A. 
B. ?
C. 
D. 