X/4 - 5 = 6 solve for x

i think the answer is 11

Me! #1 write an equation for the interior angles of this triangle that uses the triangle sum theorem. #2 what is the value of x? #3 what is the measure of #4 classify the triangle above as acute, obtuse, or right. state your reason in a complete sentence.

5x + 2 = 12 solve the following equation. then place the correct number in the box provided.

Which math sentence can be used to determine if the triangle is a right triangle?