Use the graph to find the standard equation of the circle.
A. (x - 2)2 + (y + 1)2 = 36
B. (x + 2)2 + (y - 1)2 = 36
C. (x - 2)2 + (y + 1)2 = 6
D. (x + 2)2 + (y - 1)2 = 6
Answer: A
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Find the equation of the parabola with the given properties.Vertex: (-2, -4); horizontal axis of symmetry; containing the point (18, -6)
A. 
(y + 4) =(x + 2)2
B. 
(x + 4) =(y + 2)2
C. 
(x + 2) =(y + 4)2
D. 
(y - 4) =(x - 2)2
Solve the problem.A certain radioactive isotope has a half-life of approximately 950 years. How many years to the nearest year would be required for a given amount of this isotope to decay to 75% of that amount?
A. 394 years B. 319 years C. 1900 years D. 238 years
Write as a fraction or as a mixed number20%
A. 
B. 2
C. 
D. 
Find the solution X for the matrix equation X - AX = D.
A. X = D(A - I)-1 B. X = (I - A)-1 D C. X = (A - I)-1 D D. X = D(I - A)-1 E. none of these