Can someone help me with letter (a) please I really need help

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.

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.