schooltime1234
schooltime1234 schooltime1234
  • 22-03-2017
  • Mathematics
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What is the value of x?



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apologiabiology
apologiabiology apologiabiology
  • 22-03-2017
remember all angles in triangle add to 180

x-4+3x+100=180
4x+96=180
minus 96 both sides
4x=84
divide both sides by 4
x=21 degrees
Answer Link
irspow
irspow irspow
  • 22-03-2017
100+(x-4)+3x=180

x-4+3x=80

4x-4=80

4x=84

x=21 degrees

(the three angles are 100,  63,  and 17 respectively)
Answer Link

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