Calculate the unit vector u = (cos ?)i + (sin ?)j for the given direction angle.? = 2?
A. j
B. -j
C. i
D. -i
Answer: C
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Use the Venn diagram to list the set of elements in roster form.Find A ? B.
A. {b, d, f, j, m, n, r} B. {m} C. {b, d, f, j, n, r} D. {d, f}
The equation of a parabola is given. Determine if the parabola is horizontal or vertical, the way the parabola opens, and the vertex.x = -(y + 3)2 - 4
A. vertical; opens downward; (3, -4) B. horizontal; opens to left; (-4, -3) C. horizontal; opens to left; (-4, 3) D. vertical; opens downward; (-3, -4)
Multiply.-3x(2x - 4y - 9)
A. -6x2 + 12xy + 27x B. -6x2 - 4y - 9 C. -6x2 - 12xy - 27x D. 6x2 + 12xy + 27x
Write the first six terms of the arithmetic sequence with the given properties. ? a = 8, 3rd term is 0 ?
A. 2, -2, 0, -10, -14, -18 B. 8, 12, 0, 20, 24, 28 C. 2, 6, 0, 14, 18, 22 D. 8, 4, 0, -4, -8, -12 E. none of the above