I hope someone can help. I'm trying to solve 11b and 11c:
For 11b - I don't understand why the solution is only 0 < 154.75 Celsius. I see other parts of this graph where v > 0, namely on the left-hand side of the y-axis, so I'm curious why this is not included in the solution. For example, I see v > 0, when x < -6.676 and in between -2.42 < x < 3.095 - this is without the 50 Celsius conversion. Can someone please provide clarification on this?
For 11c - I just don't know where to start in order to find this solution, so guidance would be appreciated. The solution is 133.78 degrees celsius to 139.56 degrees celsius.