Question

set up an equation to solve for x.
the triangle has angles: (x - 10)°, (2x + 5)°, 35°
options:
2x + 5 + 35 = x - 10
x - 10 + 2x + 5 = 35
x - 10 + 2x + 5 + 35 = 180
2x + 5 + 35 = x - 10

Explanation:

Step1: Use triangle angle sum property

The sum of interior angles of a triangle is $180^\circ$, so sum the given angles and set equal to $180$.
$$(x-10) + (2x+5) + 35 = 180$$

Answer:

$\boldsymbol{x - 10 + 2x + 5 + 35 = 180}$