LOL...it took me a few seconds to realize what you were attempting to express...which is the fifth root of 13 cubed...
(13^3)^(1/5) rule: (a^b)^c=a^(b*c)
13^(3*1/5)
13^(3/5)
Number of people running = number of people running / 36
(3y^6)/xz^3 is the answer to the question
5x = -50
Divide both sides by 5 to get x alone
x = -10
The answer is 3 and 4 I hope this helps