Lawrence is testing how quickly water with baking soda freezes. He adds water with baking soda to one ice tray and plain water to another ice tray. He places each tray in the freezer and records the time when each one starts to freeze. What is the treatment in this experiment?

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?