What is the slope of the line equation 7x-3y=21

Aflute is on sale for 20% off. including the discount and 8% tax, the sales price is $216.

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

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.