Ella simplifies (3b+4r)+(-2b-r) and says the result is b+5r. what error did ella make

Eileen purchased 3.4 pounds of apples at the total cost of $19.72. if she purchases 6.2 pounds of apples at this store, how much would it cost?

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 strategy is used by public health to reduce the incidence of food poisoning?