Question

I need help understanding these kind of questions. I will post the equation below because I don't know how to type in the symbols in this box. :)

Answer 1

\[\tan(\theta-\pi)\]

Answer 2

What this is is a form of a trigonometric function. Obviously you haven't had trigonometry yet, but I've been where you are.

Trig is built off of the Pythagorean theorem, and three basic ratios that can be derived from a simple right triangle: the sine function (opposite/hypotenuse), cosine function (adjacent/hyp.), and tangent function (opp./adj.). Knowing that triangles are formed of angles and line segments, certain relationships can be proven regarding the angles of triangles, in particular how they fit in the Cartesian coordinate system (4 quadrants, traditional x-y graph).
tan(θ−π)
To solve this equation knowledge of how the quadrants operate, how triangles relate to each other, and knowledge of the properties of angles of triangles is all essential. If you're interested I recommend Khan Academy's videos on trig.