"The table below shows the total cost for purchasing a certain number of equally-priced concert tickets. Write an equation to describe the relationship between t, the number of tickets, and c, the total cost of tickets."

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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.

The range would be 13 because you’re finding the difference