Help me please I need it

Nnnnneeedd 1.find the residual if you know the actual number is 5.2 and the predicted value is 4.8

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?

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?