Erin has a$ 20 bill with which to buy coffee. if she buys 2lb. if coffee at at $4/lb and spends the rest on gournet coffee at $8/lb how many pounds of gourmet coffee can she buy

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?