Hi, I am Alex, I study master degree nanoscience and photonics, I finished my bachelor studies as the top of the class student.
I have a lot of experience on solving differential equations numerically, at the moment I am doing a similar project for other freelancer and he is quite content.
I can solve entire paper you submitted in 7 days (probably 4 but the paper is extensive and I would need lot of my time, and it's exam season :) ) for 100bucks, if you know how to do most of the parts and you are stuck only on few points I can solve them them too for much lesser price, for 1st task 15e per each point (and if you need something from previous point like in 1b and 1d please provide it). for 2nd task 20e per each of the two points.