I think 30c+3d would be the correct answer.
Answer: 3900 ft^3
if you use the formula on how to find the volume of a cone
V=r^2*h/3
you will insert 30 where the r is, 13 in where h is, after you just solve that and your answer would be 3900 ft^3
No, the dots make no straight lines
The fraction is 31/100, the decimal is 0.31 which means your simplest form is 31/100