More differential equation videos, anyone?

Some have requested more videos for differential equations. 
If you go to YouTube, you will find a lot, many of which have "y=y(x)" as the unknown function.   If you are stuck at the basics and don't want the r?le of "x" to confuse you, here are a few which solve for a function of time "t". All from YouTube channel blackpenredpen: 

• First if you need it: a playlist with integrals. https://www.youtube.com/playlist?list=PLj7p5OoL6vGz0aGzNAqRtxS62nt6LrdMf
• Exponential functions from a separable differential equation: 
  https://youtu.be/OqT_zF0dCZg ^{(there was a comment about how 1:49 was quite some life lesson ...)}
• A slightly different one: https://youtu.be/Fv8Uwb0lyXM
• The logistic equation from the lecture, just with other letters: https://youtu.be/TuQnl4RMnDk
  • Note that the partial fractions decomposition from 2:00 to 3:25 is not curriculum, so you would have to that part given as a hint.  Here is one that just jumps across it: https://youtu.be/HVpWOeZ2Obo ;  To get from 2nd line to 3rd line at 1:00, you would have to be given the fact that 1/((a-x)(b-x)) = [1/(b-x) - 1/(a-x)]/(a-b) when a and b are distinct.  
    ???????Exercise: Find the general solution when b=a, that is curriculum!
• Here is a more complicated separable differential equation that you won't get on the exam, because you cannot solve the form at 4:00 for x.  But it illustrates the method! https://youtu.be/1tAZQFeAysQ
• A linear differential equation: https://youtu.be/V1ybUTJ4BMI
• And another: https://youtu.be/CekwITEuMb0