Someone please awnser my 2nd to first question im in a interm test so please get it right

What is the frequency of the sinusoidal graph?

Which of the following best describes the figure?

Which question is not a good survey question? a.don't you agree that the financial crisis is essentially over? 63on average, how many hours do you sleep per day? c. what is your opinion of educational funding this year? d.are you happy with the availability of electronic products in your state?