Which is an equivalent form of the expression 1800(1.2)-? 1800(1/2)*t
1800(5/6)*t
1800(6/5)*t
1800(2/1)*t

You can rewrite this expression as 1800 x (1/1.2)^t

Now you just simplify
= 1800(10/12)^t
= 1800 (5/6)^t

So B is your answer!

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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.