You fill a fish tank with 55 gallons of water on saturday. the water evaporates at a rate of 1.5 gallons per day you plan to add water when the tank reaches 49 gallons. when will you add water?

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?