Can you plz help me with this.

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2

Find the vertex for the parabola given by the function ƒ(x) = −3x2 − 6x.

Ahmed plans to add a rectangular sunroom to his house. the sunroom will have a length of 14 feet and a width of 10 feet, and the construction will cost $40 per square foot. how much more would the sunroom cost if it’s width were increased to 12 feet?