
Patrick B. answered 11/23/19
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X is the first...
2x is the second, since it is twice as long.
2x+4 is the third, since it is 4 cm longer than the second.
x+2x+2x+4 = 49
5x +4 = 49
5x = 45
x = 9
shortest is 9
middle is 18.
longest is 22