Solve the problem.An experienced accountant can balance the books twice as fast as a new accountant. Working together it takes the accountants 12 hours. How long would it take the experienced accountant working alone?

A. 30 hr
B. 18 hr
C. 24 hr
D. 6 hr


Answer: B

Mathematics

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Solve.10x - 25 - x2 < 0

A. (?, 5) B. (-?, 5) ? (5, ?) C. (5, ?) D. (-5, 5)

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Solve the problem.A cubic salt crystal expands by accumulation on all sides. As it expands outward find the rate of change of its volume with respect to the length of an edge when the edge is 0.23 mm.

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Find the vertex, focus, and directrix of the parabola with the given equation.(x + 2)2 = -20(y + 3)

A. vertex: (-2, -3)   focus: (-2, 2)   directrix: x = -8 B. vertex: (-3, -2)   focus: (-3, -7)   directrix: y = 3 C. vertex: (2, 3)   focus: (2, -2)   directrix: y = 8 D. vertex: (-2, -3)   focus: (-2, -8)   directrix: y = 2

Mathematics