what is the answer to: 3,500(1+8/2)^2^15

This looks like you want to know the ending amount for an investment of $3500 compounded semi-annually for 15 years at 8% per annum.....if so we have...

3,500(1+.08/2)^2^15 =

3500(1.04) ^30  =

about $ 11,351.89