Men's hiking socks regularly sell for $7.90 a pair. They are on sale at three pairs for $17.50. Esteban bought 6 pairs of socks
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Explanation to your question:
Since the sin of theta is 0.3, we can reasonably deduct that the opposite side to theta has a ration of 3 to 10 to that of the hypotenuse. Thus, the adjacent side to theta, using the pythagorean theorem, will be root91. Therefore, since the cosine of theta is the adjacent/hypotenuse, we get root 91/10