1. The problem statement, all variables and given/known data The problems are in the uploaded file. 18) satisfies the differential equation y''+p(t)*y'+q(t)*y=0 p(t) and q(t) are continuous 2. Relevant equations Wronskian of y1 and y2 3. The attempt at a solution 18) I don't really get this one 19) Solved most but at the end, where I got y2(t)=c*y1(t) I got the value of c for when t=t* but here y2=0. Can I still use it here?