What is 30 to the third power of ten

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b

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.

Solve for x and select the correct answer