Caleb and sergio stacked boxes on a shelf. caleb lifted 14 boxes and sergio lifted 12 boxes. the boxes that sergio lifted each weighed 10 lb more than the boxes caleb lifted. let c represent the weight of each box caleb lifted. which expression represents the total number of pounds sergio lifted? a. 10(c−12) b. 120c c. c + 10 d. 12(c+10) (explain your answer)