Respuesta :

Answer:

y=84

first : 84+13=97

second : 84+15=99

third : 84+23=107

fourth: 84+29=113

fifth : 84+40 =124

97+99+107+113+124 = 540

Step-by-step explanation:

sum of interior angles of a pentagon=540 degreas

y+13+y+15+y+23+y+29+y+40=540

5y=540-(13+15+23+29+40)

y=84

first : 84+13=97

second : 84+15=99

third : 84+23=107

fourth: 84+29=113

fifth : 84+40 =124

97+99+107+113+124 = 540

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