Write the standard form of the equation of the circle with the given center and radius.Center (0, -8), r = 
A. (x - 8)2 + y2 = 9
B. x2 + (y + 8)2 = 3
C. (x + 8)2 + y2 = 9
D. x2 + (y - 8)2 = 3
Answer: B
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Solve the problem.Find the foci and asymptotes of the following hyperbola:x2 - 
= 1
A. Foci: (4, 0), (-4, 0); Asymptotes: y = 
x, y = - 
x
B. Foci: (
, 0), (-
, 0); Asymptotes: y = 
x, y = - 
x
C. Foci: (
, 0), (-
, 0); Asymptotes: y = 4x, y = -4x
D. Foci: (0, 
), (0, -
); Asymptotes: y = 4x, y = -4x
Find the volume of the indicated region.The region bounded by z = 7x sin xy over the rectangle 0 ? x ? ?, 0 ? y ? 1
A. ?
B. 
C. 7?
D. 7? - 7
Transform the polar equation to an equation in rectangular coordinates. Then identify and graph the equation.r = 5
A. x2 + 
2 = 
; circle,
radius 
, center at 
in
rectangular coordinates
B. 
2 + y2 = 
; circle,
radius 
, center at 
in
rectangular coordinates
C. x2 + y2 = 25; circle, radius 5,
center at pole
D. x = 5; vertical line 5 units to the right
of the pole
Solve.Amy teaches Chinese lessons for $55 per student for a 6-week session. From one group of students, she collects $1,650. Find how many students are in the group.
A. 30 students B. 20 students C. 32 students D. 34 students