Respuesta :

Answer:

A

Step-by-step explanation:

The two sides add up to 90

so the equation is 31+4x+3=90

4x+3=59

4x=56

x=14

nar101

Answer:

A

Step-by-step explanation:

The two sides add up to 90

so the equation is 31+4x+3=90

4x+3=59

4x=56

x=14