Show that d^2y/dx^2 = (px^3+qx)/(x^2+1)^3' where and are integers to be found, and determine the nature of the stationary points of the curve. This is about differentiation, so the ' means "dy/dx of this expression"

What is the square root of 45? (step by step working plz)

What are the relative frequencies to the nearest hundredth of the columns of the two-way table?

Determine whether the quadrilateral below is a parallelogram. justify/explain your answer (this means back it up! give specific information that supports your decision. writing just "yes" or "no" will result in no credit.)