What are the domain and range of the function y = x^2 - 2x - 1?

Which of the following shows the length of the third side, in inches, of the triangle below

Solve 13 + w/7= -18 (w/7 is a fraction)

Is the response to the survey question "did you smoke in the last week question mark "response to the survey question "did you smoke in the last week? " a discrete random variable, a continuous random variable, or not a random variable?