That's not supposed to be double exponents. Double exponents must have a right parenthesis between them. It should be A=8000(1+.06/4)^(4*7) You problem is obviously a case of the compound interest formula:which is the formula for this problem: If $8000 is invested at 6% compounded quarterly, what will be the amount after 7 years? Answer: $12137.78. Edwin