1. You are given the accumulation function: at=2t+3t+1 Determine i, - the effective interest rate during the 9th year, A. Less than 0.23 B. At least 0.23, but less than 0.25 C. At least 0.25, but less than 0.27 D. At least 0.27, but less than 0.29 E. At least 0.29

1. You are given the accumulation function: at=2t2+3t+1 Determine i9 - the effective interest rate during the 9th year, A. Less than 0.23 B. At least 0.23 , but less than 0.25 C. At least 0.25 , but less than 0.27 D. At least 0.27 , but less than 0.29 E. At least 0.29