Simplify the following expression to an answer with only positive exponents. (2x^5y^7)(-5x^4z^-5) / y^12z^6

The correct answer is (edit: b).

Step-by-step explanation:

step-by-step explanation:

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arc length = radius * x ( in radians)

6 * pi = 18 * x

divide by 18 on each side

6 pi / 18 = x

pi/3 = x

the angle is pi / 3 radians

or   60 degrees