All outdoor sports: a. have a high risk of injury. b. require a high level of preparation. c. expose you to healthful levels of vitamin d. d. are expensive.

C. Expose you to healthful levels of vitamin D.

Explanation:

The practice of physical activities is good for health, especially if it is outdoors. However, those who live in the city do not always have the opportunity to exercise in open areas. This is one of the advantages of living in a high standard condominium and enjoying the leisure infrastructure.

In addition to keeping the athlete in touch with nature and fresh air, outdoor sports provide healthy exposure to vitamin D. This is one of the most complicated vitamins to replenish in the body. This is because its main source is the sun - and being in the city, playing sports indoors, the opportunity to nourish the body is lost. However, in order for your sun exposure to be healthy, it is worth avoiding the sunny hours and always use sunscreen. Thus, you practice your sport outdoors without risk of health problems.

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