$$l_n = a\phi^n + b\widehat{\phi}^n.$$

answer;

the correct answer

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the answer is b

236 cm 16 time 12 = 192

6 times 7 = 42

192+42

all of the measures need to be converted to the same measure; such as inches. if you do that it is easy to determine which is the longest, 2500 mm which is approximately 97.5 inches.