Which of the following options have the same value as 30%, percent of 81? choose 3 answers: (choice a, 30/100 x 81) - (choice b, 0.3 x 81) - (choice c, 0.03 x 81) - (choice d, 3/10 x 81) - (choice e, 30 x 81)

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

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one of the most important purposes of surface treatment is to alter surface properties according to the requirement of specific applications. for example, hydrophobic coating has been utilized on windshield and eyeglasses. gold atom monolayer on substrate has become a popular surface bioconjugation strategy.  

idk

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