The letters x and y represent rectangular coordinates. Write the equation using polar coordinates (r, ?).y2 = 16x
A. sin2 ? = 16r2 cos ?
B. r2 sin2 ? = 16 cos ?
C. sin2 ? = 16r cos ?
D. r sin2 ? = 16 cos ?
Answer: D
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Write the series in summation notation. Use the index i and let i begin at 1 in each summation.-2 + 3 - 4 + 5 - 6 + 7
A. 
B. 
C. 
D. 
Prove that the equation is an identity.
= sin ? tan ?
What will be an ideal response?
Evaluate the expression for the given values.
(a) x = 3(b) x = - 3(c) x = 0
A. (a) - 4
(b) - 
(c) - 
B. (a) - 
(b) - 
(c) - 
C. (a) - 
(b) - 
(c) - 
D. (a) - 4
(b) - 
(c) - 
Find the foci and endpoints of each axis for the given ellipse.x2 + 16y2 = 16
A. Foci: (0, ±
); vertices: (± 4, 0 );
endpoints of the minor axis: (± 1, 0)
B. Foci: (±
, 0); vertices: (± 4, 0);
endpoints of the minor axis: (0, ± 1)
C. Foci: (±
, 0); vertices: (± 3, 0);
endpoints of the minor axis: (0, ± 1)
D. Foci: (± 15, 0); vertices: (± 16, 0);
endpoints of the minor axis: (0, ± 1)