Find a parametric equation of the indicated ellipse.
A. x = 6 cos t + 2, y = 3 sin t - 1
B. x = 6 cos t - 2, y = 3 sin t + 1
C. x = 3 cos t - 2, y = 6 sin t + 1
D. x = 3 cos t + 2, y = 6 sin t - 1
Answer: B
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Use the information given about the angle ?, 0 ? ? ? 2?, to find the exact value of the indicated trigonometric function.cos ? = - 
, sin ? > 0Find cos 
.
A. - 
B. 
C. - 
D. 
Factor the trinomial completely.4x5 + 32x4 + 48x3
A. x3(4x + 8)(x + 6) B. x3(x + 2)(4x + 24) C. 4x3(x + 2)(x + 6) D. 4x3(x2 + 8x + 12)
Find the moment or center of mass of the wire, as indicated.Find the center of mass of a wire that lies along the semicircle y = 
if the density of the wire is 
.
A. 
= 0, 
= 1
B. 
= 
, 
= 
C. 
= 0, 
= 
D. 
= 1, 
= 1
The two triangles below are similar. Find the missing lengths.
A. x = 4 B. x = 6 C. x = 3 D. x = 9