Mr. Davis buys 5 packages of the package a glue sticks. Ms. Wilson buys 8 packages of the package b glue sticks. Use your equations to find the difference in the Total number of glue sticks that each person purchased. I need answers please

It says in the questions that it is 6.5?

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?