If RS=23-2x, ST=9x-5, and RT=39, find RS

Find the difference (8ab+a+2) - (3ab+6)

What is the 12th term of b(n)=-4-2(n-1)

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.