A. ( 5).(-4).(-2) = c. (-2).(-2).(-2).(-2).(-2)= e. (-1.)(-1).(-1).(-1).(-1).(-1) b.(3).(-2).(-7).(-2)= d. (7).(-1).(-1).(-1).(6)=
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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.

1. use commutative property to reorder the terms.2x+81=0.2. move the constant to right side by adding its opposite on both sides. 2x+81-81=0-81.2x=(-81).3. divide the equation on both sides.2x ÷ 2 = 81 ÷ 2.x = -81/2. your answer is -81/2. if you need to simplify it into a decimal, it’s -40.5.