A pair of athletic shoes costs $85. If the inflation rate remains constant at 6%, write an algebraic rule to determine the cost, c(t), of the shoes after t years.

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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.