Free variables are variables that can take on any value. how many free variables are in the system?

The focus of a parabola is (-4,-5) and its directrix is y=-1 find the equation

Benefit(s) from large economies of scale, in which the costs of goods decrease as output increases. natural monopolles perfect competition

2polnts what is the value of the fourth term in a geometric sequence for which a = 10 and r= 0.5?