Answer:
y = 18.4
Step-by-step explanation:
[tex]12^{2} + 14^{2} = y^{2}[/tex]
144 + 196 = [tex]y^{2}[/tex]
340 = [tex]y^{2}[/tex]
y = [tex]\sqrt{340}[/tex]
y = 18.4 (to 3 significant figures)