PLEASE HELP with math

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.

Sketch one cycle if the cosine function y=2cos2theta

If a || b and e || f , what if the value of y ?