Math help please please I’m not gonna believe those links don’t try

Which of the following expressions is equal to 2x^2+8

What expression is equivalent to 42x-56y

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.