If f(x) = x(4x² - 3), then what is f(sinθ) equal to ?  

What is $\lim\limits_{x \rightarrow 5} \frac{5-x}{|x-5|}$ equal to ?

What is $\lim\limits_{x \rightarrow 1} \frac{x^9-1}{x^3-1}$ equal to ?

The mean and variance of five observations are 14 and 13.2 respectively. Three of the five observations are 11, 16 and 20. What are the other two observations ?