Hello,
The 3th angle of the triangle is the supplement of 3x-8:
180-(3x-8)=180-3x+8=188-3x
The sum of all angles of the triangle is 180
180=2x+21+188-3x
==>180=-x+21+188
==>x=21+188-180
==>x=21+8
==>x=29
<em>the difference of the means is significant because the rerandomizations show that it is outside the range of what likely happens by chance.</em>
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The answer is 11.
Hope this helps!
Answer:
12 squared unit
Step-by-step explanation: