When you take two from six and have six left what changed?

Find two rational expressions that have the difference of 2-n/n-4

An energy plant is looking into putting in a system to remove harmful pollutants from its emissions going into earth's atmosphere. the cost of removing the pollutants can be modeled using the function c = 25000p/100 -p what is the vertical asymptote?

Sketch one cycle if the cosine function y=2cos2theta