A thermometer shows a temperature of -20 3/4 degrees. A chemist recorded the temperature in her notebook using a decimal. Which number did the chemist write in the notebook?

(answer choices in the pic)

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?