SHOW ALL OF WORK. Find missing length, round to the nearest tenth if necessary.

Answer:
15
Step-by-step explanation:
to do this you need to use the Pythagorean theorem
a^2+b^2=c^2
9^2+12^2=c^2
81+144=c^2
[tex]\sqrt{225}[/tex]=[tex]\sqrt{c^2}[/tex]
c=15