Y - 13 = 4 (x-2) put the equation in standard form with a positive x coefficient

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.

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Suppose y varies directly with x. write a direct variation equation that relates x and y. then find the value of y when x=12 y=7 when x=3