Question
Bobby used 3 rubber bands to form the sides of triangle DEF where DE = 7 cm, EF = z cm and DF = 3z cm. Glen stretches two of the elastic bands and enlarges triangle DEF. The sides EF and DF are stretched to 2 times its original length. What is the perimeter of the stretched triangle DEF?
2 m

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Bobby used 3 rubber bands to form the sides of triangle DEF where DE = 7 cm, EF = z cm and DF = 3z cm. Glen stretches two of the elastic bands and enlarges triangle DEF. The sides EF and DF are stretched to 2 times its original length. What is the perimeter of the stretched triangle DEF?