The businessman finds when he produces 10 items, his cost is $200, when he produces 20 items his cost is $250. Find his marginal cost

y=20x

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the answer is 9 because the question is telling how much it be together.

answer is 270 degrees: -

to convert radians to degrees you multiply by 180/π

9π/ 6 * 180 / π

=   9 * 180 / 6

= 9 * 30

=   270 degrees   answer