Me urgent don't know if i did it right

Which expression is rational? 6. , square root two, square root 14, square root 49

Solve the equation for b: a= (1/2)(b)(h)

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?