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z^4 + 81 = 0 (solve) change it to polar, then take the root. z^4= 81@180 z= 3@180/4 + n90 where n=0, 1, 2, 3 check: z= 3@180/4 + 3*90=3@315 z^4=81@(4*315)=81@1260= 91@180=81 you can check it at the other roots also. this is what i … 
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The measure of an interior angle of a regular polygon is 135 degrees. Find the number of sides in the polygon. This is what I tried: 180(x2)=135 [Interior Angle Sum Theorem] x2=.75 x=2.75 That can't be right though. Help? 
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The formula A = 180(n2)/n relates to the measure A of an interior angle of a regular polygon to the number of sides n. If an interior angle measures 120 degrees, find the number of sides A)5 B)6 C)8 D)10 I have NO clue on how to do … 
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Solve for n á = (n2) * 180 / n = 180 – 360/n 
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sin2x+cosx=0 , [180,180) = 2sinxcosx+cosx=0 = cosx(2sinx+1)=0 cosx=0 x1=cos^1(0) x1=90 x2=36090 x2=270 270 doesn't fit in [180,180) what do I do? 
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