For (29) under the vertical line on the left put the 5 deg Celsius and under the vertical line to the right put the 20 deg Celsius now the temperature in between these temperatures is what is needed in the penguin enclosure and this is what’s called a compound or union statement (- ♾️ , 5 ] U [ 20, ♾️) I believe this is the type of statement that explains the given condition.