Can someone please help me ( image provided )​

Ineed to know the answer to this algebra question.

At a kentucky friend chicken, a survey showed 2/3 of all people preferred skinless chicken over the regular chicken. if 2,400 people responded to the survey, how many people preferred regular chicken?

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b