In which way does stephen hawking use mathematics in his work?

Which of the following explains why it took so long for the public to accept the negative health effects of smoking? a)people were waiting for counter reasons, and those were presented.b)scientists had not completely finalized their results, which took 30 years.c)cigarettes were cheaply available and media channels were very inefficient.d)cigarette manufacturers were trying hard to bring an alternative into the market

The two required components for a generator are

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer