Two different C++ projects done with Qt using QCustomPlot widget.
Q1, Q3 & Q4 are done in the project named as "demonstrate" (was playing with Qt till the target was achieved so named that :D ) Q5 is done in seperate project (q5 under q5 folder) as it had 2 bezier curves.
Project link: http://www.stewartcalculus.com/data/CALCULUS%206E/upfiles/projects/ess_wp_0902_stu.pdf