Help!!! Solve for variable and show steps

Ahomeowner plans to hang wallpaper on one wall of a bedroom that is 10 feet long if a stripe of wallpaper is 20 inches wide and stripes or hung vertically how many stripes on wall paper with the homeowner required

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

Credit card a offers an introductory apr of 3.4% for the first three months and standard apr of 15.7% thereafter,