The temperature is 3.0 at $ t = 4 $, so the next instant it exceeds. Since 2004 is part of the continuous model, and the question asks for the year, we report 2004 only if it first exceeds during that year. But 2004 already reaches it. Does it exceed? No, it is equal. So the first year when it exceeds is 2005? But 2004.1 is in 2004. - Treasure Valley Movers