Factor completely. If a polynomial cannot be factored, say it is prime.20x6 - 25x3 - 16x3 + 20

A. (20x3 + 4)(x3 + 5)
B. (5x6 - 4)(4x - 5)
C. (5x3 + 4)(4x3 + 5)
D. (5x3 - 4)(4x3 - 5)


Answer: D

Mathematics

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A.
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Solve the problem.A wheel with a 36-inch radius is marked at two points on the rim. The distance between the marks along the wheel is found to be 9 inches. What is the angle (to the nearest tenth of a degree) between the radii to the two marks?

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