Solve y(y−10)+30=0 by using the quadratic formula. If there is no real solution

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

What is the value of x in the this question ?

Alcoa was $10.02 a share yesterday. today it is at $9.75 a share. if you own 50 shares, did ou have capital gain or loss ? how much of a gain or loss did you have ? express the capital gain/loss as a percent of the original price