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Sagot :

Answer:

Step-by-step explanation:

The square means a [tex]90[/tex] degree angle.

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

Combining like terms on the left side gives [tex]7x+96=180[/tex]

Subtracting [tex]96[/tex] from both sides gives [tex]7x=84[/tex]

Dividing both sides by [tex]7[/tex] gives [tex]\boxed{x=12}[/tex]