What is the value of x 14, 15, 5 and X

1.√250
2.√296
3.√306
4.√421
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unless if u could do my questions, if not i wouldn't want to

1) 2/5

2) zero=0/1

3) zero=0/2

4) -4/5

5) undefined=3/0

180°

step-by-step explanation:

sum of equilateral triangle=180°

< n=60°

< m=120°°[angle supplementary of equilateral angle]

< m+< r+< x=360°(sum of exterior angle of triangle)