Acollection of 8 backpacks has a mean weight of 14 pounds. a different collection of 12 backpacks has a mean weight of 9 pounds. what is the mean weight of the 20 backpacks? explain how you found your answer.

What mathematical statement is missing ? ? the answer is b

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?