2 answers:
Answer:
1) Mistake is that vertical angles are congruent and equal meaning the product of 5x should be equal to the other side being 100. Answer is x=20
2) Mistake is that the angle's measure should've added up to 90. Answer is x=17
3) The math is done incorrectly with the first step as the coefficients can't be added with constants. Answer is x=21.5
Step-by-step explanation:
The following image is written proof
Answer:
1. Since the angles on the both sides are the same
5x = 100
x = 20
The mistake is that it is absolutely unnecessary to use 180.
2. It is a right angle, which means it would be 90 degrees instead of 180.
3x + 39 = 90
3x + 39 - 39 = 90 - 39
3x = 51
3x = 17
3. The process is wrong
It should be
6x + 2x + 8 = 180
8x + 8 = 180
8x = 172
x = 21.5
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