Question

I need help to solve please

Answer 1

x = 8

Explanation:

Angle sum property of triangle states that the sum of interior angles of a triangle is 180°.

So,

`\rm \longrightarrow 45 \degree + 80 \degree + (9x - 17) \degree = 180 \degree \\ \\ \rm \longrightarrow 125 + 9x - 17 = 180 \\ \\ \rm \longrightarrow 108 + 9x = 180 \\ \\ \rm \longrightarrow (108 - 108) + 9x = 180 - 108 \\ \\ \rm \longrightarrow 9x = 72 \\ \\ \rm \longrightarrow (9)/(9) x = (72)/(9) \\ \\ \rm \longrightarrow x = 8`