What is the period of a cosine and sine function

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

At $1.32 million, they closed last month percent above what they paid in 2007." how much did they pay in 2007?

Unaware that 35% of the 10000 voters in his constituency support him, a politician decides to estimate his political strength. a sample of 200 voters shows that 40% support him. a. what is the population? b. what is the parameter of interest? state its value c. what is the statistics of the interest? state its value d. compare your answers in (b) and (c) is it surprising they are different? if the politician were to sample another 200 voters, which of the two numbers would most likely change? explain