u/Ice-Ice-B4by

So I ran into this problem on a practice exam (not from AEI). I’ve been studying using AEI’s handouts and books, and I solved it using the formulas they provided, but I still got it wrong.
Did AEI ever cover this, or did I miss something in the reference material? Anyone else run into this?

Hey guys, I’m working through this problem and got stuck on where the minimum and maximum formulas come from. Are those provided in the handouts or in the reference manual? If so which pages on AEI?