You have $2 and earn $0.50 for each cup of lemonade you sell. write an equation in two variables that represent the total amount a (in dollars) you have after selling c cups of lemonade.

C = number of cups of lemonade sold.
A = total amount earned.

A = 2 + 0.5c

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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.