Help me with these math with steps

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.

W-16=-12 solve each one step equation plz

Which of the following circles have their centers on the x-axis? check all that apply.