Aplumbers bill is £463.20 plus vat. the current rate of vat is 20% what is the actual cost of work done

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.

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"