Answer:
29
Step-by-step explanation:
The answer is "29" or the second option.
![ST=13](https://img.qammunity.org/2021/formulas/physics/middle-school/ccp8m3jho8ymjalevcczc6sp86m59b1kmv.png)
![RS=16](https://img.qammunity.org/2021/formulas/physics/middle-school/8eou2k7h1f4cm1pc3o7fgev8624xouix6p.png)
![13+16=29](https://img.qammunity.org/2021/formulas/physics/middle-school/emnkap0xyeykkxtvf5s9td7lu5t23acznx.png)
![RT=29](https://img.qammunity.org/2021/formulas/physics/middle-school/udwtdwz3kcm2g0cvpqrj67g0hvyn70jydr.png)
Three is way too small of a number to be the answer to the length of this line so the only answer that makes since is 29. (if there is more then 2 options feel free to let me know)
Hope this helps