Translate phrases algebraic expressions, half a number

X+y=-4 x-y=2 use elimination with adding and subtraction

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?

Find the volume of the wedge cut from the first octant by the cylinder z=12-3y^2 and the plane x+y=2.