Hi Fellows: If anyone has access to a copy of 'Differential Equations with Boundary-Value Problems (THIRD edition)' by Dennis G. Zill and Michael R. Cullen, I just need you to paste here or dictate to me on phone the following problem equations: 1. Problem no. 12 of chapter 4 review exercise. 2. Problem no. 23 of chapter 4 review exercise. I will be very, very thankful to you. Best Regards.