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 - 12x + 2y + 21 = 0
A. (x - 6)2 + (y + 1)2 = 16
center (6, -1), r = 4
B. (x + 6)2 + (y + 1)2 = 16
center (-6, -1), r = 4
C. (x + 6)2 + (y - 1)2 = 16
center (-6, 1), r = 4
D. (x - 6)2 + (y - 1)2 = 16
center (6, 1), r = 4
Answer: A
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Given that the polynomial function has the given zero, find the other zeros.f(x) = x4 - 9; 
A. -
B. -
, 3i, -3i
C. -
i, 
i, -
D. 
i
Solve the problem.To find the height of this tree, Sarah marked the tree at eye level, 1.8 meters above the ground. She measured 36 m from the base of the tree and then held a 5-cm ruler vertically in front of her eye until the ruler just obscured the tree above the mark. Using a string tied through a hole in one end of the ruler, Sarah found that the distance from her eye to the ruler was 4.8 centimeters. What was the height of the tree? Round to the nearest unit.
A. 35 m B. 39 m C. 37 m D. 41 m
Factor completely. If the polynomial cannot be factored, say it is prime.x4 - 256
A. (x2 + 16)(x + 4)(x - 4) B. (x2 - 16)2 C. (x2 + 16)2 D. prime
Solve the problem.If the probability that an identified hurricane will make a direct hit on a certain stretch of beach is 0.01, what are the odds against a direct hit?
A. 99 to 1 B. 1 to 100 C. 100 to 1 D. 98 to 1