The y-Int and the slope of C=7n+20

If you can show the formula

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?

Mrs. gehrke said cheddar weighs 16.8 pounds. he actually weighs 15.2 pounds. what is the percent error?

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?