From 125c90e3fd6580aad06d73d992439981391b6a1b Mon Sep 17 00:00:00 2001
From: Andrew Lorimer <andrew@lorimer.id.au>
Date: Fri, 8 Mar 2019 09:43:34 +1100
Subject: [PATCH] literal equations / exponential modelling

---
 methods/stuff.md | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/methods/stuff.md b/methods/stuff.md
index adbb286..661a69f 100644
--- a/methods/stuff.md
+++ b/methods/stuff.md
@@ -57,3 +57,18 @@ Inverse of $f: \mathbb{R} \rightarrow \mathbb{R}, f(x)=a^x$ is $f^{-1}: \mathbb{
 ## Euler's number
 
 $$e= \lim_{n \rightarrow \infty} (1 + {1 \over n})^n$$
+
+## Literal equations
+
+_Literal equation_ - no numerical solutions
+
+## Exponential and logarithmic modelling
+
+$$A = A_0 e^{kt}$$
+
+where  
+$A_0$ is initial value  
+$t$ is time taken  
+$k$ is a constant  
+For continuous growth, $k > 0$  
+For continuous decay, $k < 0$
-- 
2.47.1