Write each product in standard form!! Please help :))

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

If there is no real number solution to the quadratic equation x^2+2x+c=0 what is a possible value of c? 1 -2 0 3

Two streets intersect at a 30- degree angle. at the intersection, the are four crosswalks formed that are the same length. what type of quadrilateral is formed by the crosswalks?