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22-03-2017
Mathematics

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What is the value of x?

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What is the value of x Enter your answer in the box x class=

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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

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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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