Solve. Answer with a number only. -2/5(x+6)=10

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

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?

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0