Solve the inequality.
? 3
A. x ? -3
B. x ? 3
C. x ? -3, x ? 3
D. -3 ? x ? 3
Answer: D
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Solve the system of equations by Gaussian elimination. If there is an unlimited number of solutions, find two of them. 6x - 3y + 4z = 9 4x + 8y + 6z = 9 18x - 9y + 12z = 2
A. x = 0, y = 0, z = 0 B. x = 9, y = 9, z = 2 C. x = 3, y = 3, z = -1 D. Inconsistent
Use the vertical line test to determine whether or not the graph is a graph of a function.
A. No B. Yes
Determine two pairs of polar coordinates for the point with 0° ? ? < 360°.(-2
, 2
)
A. (2
, 120°), (-2
, 240°)
B. (2
, 150°), (-2
, 210°)
C. (2
, 30°), (-2
, 330°)
D. (2
, 135°), (-2
, 315°)
The letters x and y represent rectangular coordinates. Write the equation using polar coordinates (r, ?).x2 + y2 - 4x = 0
A. r cos2 ? = 4 sin ? B. r sin2 ? = 4 cos ? C. r = 4 sin ? D. r = 4 cos ?