Peter and Seija evaluated the expression Peter said the answer was 135. Seija said it was 61. Who is correct? What error did the other person make?

LS30a 1-8-18 What we are studying We will be studying the dynamical systems 1. Dynamical systems: Real world context and situations in which some quantities are changing with time 2. Example - populations change over time, body temperature changing over time, the room changes degrees all the time 3. We will be trying to build and study mathematical models of these...