A shipping company uses the weight of packages to determine shipping prices. For any item 5 pounds or greater, the following equation gives the price, P(w), of shipping the item between two locations as a function of the item’s weight, w, in pounds. The company does not use the following equation to determine shipping prices for items which are greater than 100 pounds.

For any item 5 pounds or greater, the following equation gives the price, p(w), of shipping the item between two locations as a function of the item's weight, w, in pounds. Then, the equation is for w>=5 (pounds).

The company does not use the following equation to determine shipping prices for items which are greater than 80 pounds. Then, the equation is used for
w<=80 (pounds)

The domain of p(w) is the values we can give to w, then
Domain of p(w) is 5<=w<=80
Domain of p(w) = [5, 80]

Domain of p(w) = [5, 80]