Last night erin completed 5/6 of the homework assignment. tom completed 1/3 of the same assignment. how much more of the assignment did erin complete?

What am i doing here. add?

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.