3. Remember galk? It was the substance you discovered on exam four. It turns out that your previous calculations were incorrect. Rather than decay, galk radioactively increases by 15% every five days. This is an Earth shattering discovery as it breaks all known laws of physics. How long until your current pile of galk doubles in size? (3 points) 4. Your research into the stock market tells you that total revenue is the sum of two parts. the revenue for fear and the revenue for greed. Your model for fear is given by 12 =r(3 - x) where r, is the revenue of fear. Your model for greed is given by 4 = r2(x - 2) where r2 is the revenue for greed. For both parts, 0