Which choice shows a Correct way to solve 8x13

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

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.

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?