Question

Please please help me!!!

Answer 1

Answer:

Step-by-step explanation:

The square means a $90$ degree angle.

We know that all the angles in a triangle add to $180$ degrees. So, we can build an equation for x: $(2x+1)+(5x+5)+(90)=180$

Combining like terms on the left side gives $7x+96=180$

Subtracting $96$ from both sides gives $7x=84$

Dividing both sides by $7$ gives $\boxed{x=12}$