Find the equation of the circle in standard form, and then identify its center and radius.
?
?
A. 
Center: 
Radius: 
B.
Center: 
Radius: 
C.
Center: 
Radius: 
D.
Center: 
Radius: 
E.
Center: 
Radius: 
Answer: C
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Expand using the binomial theorem.(x - 9y)5
A. x5 - 45x4y + 810x3y2 - 7290x2y3 + 32,805xy4 - 59,049 B. x5 - 45x4y + 1620x3y2 - 14,580x2y3 + 32,805xy4 - 59,049y5 C. x5 - 45x4y + 1620x3y2 - 14,580x2y3 + 32,805xy4 - 9y5 D. x5 - 45x4y + 810x3y2 - 7290x2y3 + 32,805xy4 - 59,049y5
Evaluate the factorial expression.
A. 6
B. 
C. 30
D. 2!
?Determine the open intervals on which the graph of 
is concave downward or concave upward.
A. ?concave upward on 
; concave downward on 
B. ?concave downward on 
C. ?concave upward on
D. ?concave downward on ; ?concave upward
E. ??concave upward on 
; concave downward on 
Approximate the value using a calculator. Express answer rounded to three decimal places.?e
A. 22.459 B. 23.141 C. 5.860 D. 8.540