Broken brain

No.12413770 ViewReplyOriginalReport
I have some questions. How do people memorize formulas and does visualizing them help? In what ways do you visualize formulas? Also it seems like my teacher just picks and chooses which decimal place to continue the formula from and I am having trouble determining if I calculate to the 3rd or 7th or 8th decimal at given points.

I just never know what to do and when. I google the concepts and its like the calculators for "annuities and investments" are totally different than the formulas Im given because I get different answers. I watch videos and people just go from A to Z and I'm like wtf why are you suddenly dealing with Z what about B..
and C.... Etc