Answer:
I'm not to sure, but I'll say 10.5
If you multiply 3.50 x 3 you'll get 10.5
If you add you'll get 13.5.
If it's an addition I'll recommend to go with 13.5
If it's a multiplication I'll recommend to go with 10.5
πr²h= 1696
⇒r²=1696/3.14×15
⇒r²=36.009
⇒r=√36.009
∴r=6.0008=z
