What is another word for change in y

Which rational number could be graphed between -4 and -5

In which form is the following function written? y = - 2(x – 3)(x + 5)

Graph g(x)=2cosx . use 3.14 for π . use the sine tool to graph the function. graph the function by plotting two points. the first point must be on the midline and closest to the origin. the second point must be a maximum or minimum value on the graph closest to the first point.