Assuming the teacher means zero Fahrenheit, the same temperature is minus 17.7 degrees Celsius. If the zero is Celsius, changing it to Fahrenheit gives you 32 degrees. But, the teacher said it's going to be twice as cold, and that is something completely different and more complicated.
Beethoven is considered the transitional figure between Classical composers Haydn and Mozart on the one hand, and the Romantics on the other. His innovations included his construction of his Sixth Symphony (The Pastoral) as program music and his expansion of the quartet, concerto, sonata, and symphony forms.
Karl van Beethoven, son of Carl and Johanna, was the only child of the three Beethoven brothers, and thus the sole Beethoven of the next generation. Beethoven, his uncle, saw Karl as the Beethoven to carry the illustrious musical name forward. Even before Carl's death, Beethoven saw himself as guardian of his nephew, determined to rescue him from the clutches of his (as he saw it) immoral mother.