Exogenous depression is usually caused by:
a. a biochemical imbalance.
b. traumatic events such as rape, assault, war, or airplane crashes.
c. external events such as the loss of something or someone of great value.
d. lack of adequate sunlight.

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a, b, c - sides of a triangle

a + b > c

a + c > b

b + c > a

we have a = 5m and b = 11m. substitute:

5 + 11 > c

16 > c → c < 16

5 + c > 11         subtract 5 from both sides

c > 6

11 + c > 5         subtract 11 from both sides

c > -6

c < 16 and c > 6 and c > -6

thereofre your answer is 6m < c < 16m