Question
Bobby used 3 elastic bands to form the sides of triangle RST where RS = 9 cm, ST = z cm and RT = 2z cm. Gabriel stretches two of the elastic bands and enlarges triangle RST. The sides ST and RT are stretched to 2 times its original length. What is the perimeter of the stretched triangle RST?
2 m

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Bobby used 3 elastic bands to form the sides of triangle RST where RS = 9 cm, ST = z cm and RT = 2z cm. Gabriel stretches two of the elastic bands and enlarges triangle RST. The sides ST and RT are stretched to 2 times its original length. What is the perimeter of the stretched triangle RST?