...I got a perfect score on the math portion of the ACT, and of course I have learned much since then. I also know a thing or two about standardized tests so can give you some strategic pointers. Differential equations are equations involving one or more derivatives of an unknown function. (read more)
...I like to explain it in simpler, made-up, reverse-calculus words. Of course, it's a playful way to explain nerdy, technical concepts. Linear Algebra was a hard class for me at the time. (read more)