Use the expression x - 6 / x + 4 how many excluded values are there?

The function ƒ is defined by ƒ(x) = (x + 3)(x + 1). the graph of ƒ in the xy-plane is a parabola. which interval contains the x-coordinate of the vertex of the graph of ƒ?

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

I’m confused on how to work the pie charts