Write the expression as a polynomial, using the corresponding formula for special product: (−y+x)(x+y), (−a+b)(b–a),(−b–c)(b–c),(x+y)(−x–y) ,(x–y)(y–x),(−a–b)(−a–b)

This polygon has 4 sides
180(4-2) = 180(2) = 360 degree
80+90+2x + 3x = 360
170+5x = 360
5x = 190
x= 38
measure of angle t is 2(38)= 76
the answer is c. trust me
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Neither is the 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.