Question

Determine o valor de x.  a) 7,5º b) 15º c) 30º d) 45º ​

Answer 1

$\boxed{\begin{array}{l}\sf2x+40^\circ+6x+20^\circ=180^\circ\\\sf 2x+6x=180^\circ-40^\circ-20^\circ\\\sf8x=120^\circ\\\sf x=\dfrac{120^\circ}{8}\\\\\sf x=15^\circ\\\\\huge\boxed{\boxed{\boxed{\boxed{\sf\maltese~alternativa~b}}}} \end{array}}$