Which number produces an irrational number when multiplied by 0.5

1-for what value of x is line a parallel to line b 2-for what value of x is line a parallel to line b

Find the measure of the interior angles of the following regular polygons: a triangle, a quadrilateral, a pentagon, an octagon, a decagon, a 30-gon, a 50-gon, and a 100-gon.

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)