1. The problem statement, all variables and given/known data In order to decrease the fundamental frequency of a guitar string by 4%, by what percentage should you reduce the tension? 2. Relevant equations f = sqrt [T/(m/L)] / 2L I believe that is the equation that relates frequency to tension... 3. The attempt at a solution I plugged in some theoretical values and got 76.96% which seemed wrong, and it is :) How can I go about solving this problem?