8. Which short-term goal would help you reach your long-term goal of running a marathon? a. practice taking off from blocks
b. learn how to downhill ski
c. begin running a comfortable distance, add distance gradually
d keep your heart rate as close to your resting heart rate as possible when exercising

C. begin running a comfortable distance, add distance gradually

Explanation:

Sorry if this is wrong-

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