Pls help with mah hw

Multiply −2x(6x^4−7x^2+x−5) express the answer in standard form. enter your answer in the box.

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

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?