Question 351344
Hi,
Let x represent the shortest side
.
Question states

x + 2x + (x + 10) = 38 ft
.
simplify and solve
4x + 10 = 38ft
4x = 28
x = 7 ft
2x = 14 ft
(x+10) = 17ft
. 
check your answer
7ft +14ft + 17ft = 38ft