The sum of 30 times (1/3)^(n-1) from 1 to infinity

(hurry! ) which expression is equivalent to the following complex fraction?

Ineed if you could explain and give me the answer you! this needs done

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 ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.