What would the frequency be?

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.

Find the area of the regular hexagon if a side is 20 cm.

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way