PLEASE HELP AND EXPLAIN ILL MARK BRAINLIEST question:the stem and leaf plot shows the number of boxes bought by ms Jones what is the sum of the three greatest numbers of boxes he bought?

The answer would be d i think but i’m for sure it is not a and c

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?