Respuesta :

2(5x + 15) + 2(4x + 3) = 360
10x + 30 + 8x + 6 = 360
18x = 324
    x = 18

so

RST = 
5x + 15 = 5(18) + 15 = 105

answer

RST = 105 degree

Answer:

c: 105°

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