Given that 7^2=12^x, evaluate 12^2x

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?

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.

Which one is the correct answer, and why?