Find the center and the radius of the circle.y2 + 20y + 100 = 10x - x2 - 21
A. (4, 10); r = 4
B. (5, 12); r = 5
C. (5, -10); r = 2
D. (5, 11); r = 3
Answer: C
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How would you find the area of a circle, given the area of the sector with radius 30 feet, and central angle 120?? ??
A.
120? is 1/4 of a circle's revolution; Therefore, the area of the circle is 4 times the area of the sector.
B.
?120? is 1/3 of a circle's revolution; Therefore, the area of the circle is 3 times the area of the sector.
C.
?120? is 1/4 of 180?; Therefore, the area of the circle is 4 times the area of the sector.
D.
?The area of the circle is: 
.
E.
?b and d are correct.
Rewrite using numbers and an inequality symbol.Six is greater than one.
A. 6 < 1 B. 6 > 0 C. 1 > 6 D. 6 > 1
Rewrite the expression in terms of exponentials and simplify the results.sinh (7 ln x)
A. 
B. 
C. 2x
D. 
Simplify the expression. 
A. 
B. 
C. 
D. 