Help please (I think it’s c or d but i need conformation will give brainliest)

Module 10 coordinate proof using slope and distance answers is quadrilateral abcd a parallelogram? explain how you know.

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?

Find the value of x that will make l ll m