Write 28/63 in simplest form

Factor the expression using gcf 9b+45

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?

Ireally don't understand this, i'm really an idiot but i want to know how to figure this out. !