Answer:
5

Explanation:
in a 30-60-90 triangle the ratio of sides, respectively, is 1 :
: 2
you can set up a proportion like this to solve for 'x':
/ 1 = 15 / x
cross-multiply:
x = 15
x = 15/

rationalize the denominator by multiply top and bottom by

you get 15
÷ 3 which is 5
