Explain please thanks

Question

01-10-2017
Mathematics

contestada

Explain please thanks

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Catya Catya · Answer 1 · 2017-10-01T04:40:40+02:00

Catya Catya

01-10-2017

all the angles inside a triangle add up to 180°.

(2x + 15) + (5x + 5) + x = 180
8x + 20 = 180
8x = 180 - 20
8x = 160
x = 160/8
x = 20
the question is asking what angle B is,
B = 2(20) + 15
B = 40 + 15
B = 55°

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