For this case we have that by definition, the sum of the internal angles of a triangle is 180 degrees. So, we have:
![(5x + 12) + (6x + 30) + (2x + 8) = 180\\5x + 12 + 6x + 30 + 2x + 8 = 180](https://tex.z-dn.net/?f=%285x%20%2B%2012%29%20%2B%20%286x%20%2B%2030%29%20%2B%20%282x%20%2B%208%29%20%3D%20180%5C%5C5x%20%2B%2012%20%2B%206x%20%2B%2030%20%2B%202x%20%2B%208%20%3D%20180)
We add similar terms:
![13x + 50 = 180\\13x = 180-50\\13x = 130\\x = \frac {130} {13}\\x = 10](https://tex.z-dn.net/?f=13x%20%2B%2050%20%3D%20180%5C%5C13x%20%3D%20180-50%5C%5C13x%20%3D%20130%5C%5Cx%20%3D%20%5Cfrac%20%7B130%7D%20%7B13%7D%5C%5Cx%20%3D%2010)
Answer:
![x = 10](https://tex.z-dn.net/?f=x%20%3D%2010)
Option D
13/5: rational
sq root of 52: Not rational
7.63: rational
0.0584: rational
square root of 25/36: rational
square root of 5/17: not rational
0.65 (65 repeating): rational
square root of 121: rational
The answer is C.......Sports Stamps = 4 , Holiday Stamps = 2 , Presidents Stamps = 8. He said 4 times as many presidents than holiday. So the number of presidents stamps is the product of the holiday stamps times 4. 4 times 2 is 8. Add them all together
The solution to the given linear equation is x=1
<h3>Solution to linear equation</h3>
Linear equations are equations that has a leading degree of 1.
Given the linear equation as shown below;
8x - 5= 2x + 1
Subtract 2x from both sides
8x - 2x - 5 = 2x + 1-2x
6x - 5 = 1
Add 5 to both sides
6x - 5 + 5 = 5 + 1
6x = 6
Divide both sides by 6
6x/6 = 6/6
x = 1
Hence the solution to the given linear equation is x=1
learn more on linear equation here: brainly.com/question/14323743
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A² + b² = c²
11² + 9² = c²
121 + 81 = c²
202 = c²
√202 = c
14.2126704035518955 = c
Rounded 14.2126704035518955 ≈ 14.2
I hope this helps. (: