What is the value of x?

What is the missing constant term in the perfect square that starts with x^2 -20x

Find the equation of the line with slope =8 and passing through (6,53) write your equation in the form y=mx+b

Astore has clearance items that have been marked down by 60%. they are having a sale, advertising an additional 55% off clearance items. what percent of the original price do you end up paying?