Plz help it would help if you showed all steps on paper

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

*let m∠cob = 50°30’, m∠aob = 70° and m∠aoc = 20°30’. could point c be in the interior of ∠aob? why? a. point c could be the interior of aob but it is not the only case b. point c is the interior of aob c. point c is not the interior of aob d. the given is not possible for the plane geometry answer

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2