Anyone ??? I need help

Ineeeeed this is due tomorrow and i dont know the answer can you find all the exponents

What are the exclude value of mn+3m

Liz is shipping a package to her friend. the maximum weight of a medium flat-rate box is 20 pounds, including the box which weighs 6 ounces. write and solve an inequality to describe the possible weight in pounds, w, of the contents that liz will ship to her friend if she must use a medium flat-rate box. use the drop-down menus to explain your answer.