The third term in an arithmetic sequence is 81. The common difference for the arithmetic sequence is -5.
072 Points
SHORT ANSWER
Question 17
What is the initial (zero) term of the sequence?
Explain how to use the common difference to find
this O term.
Use mathematical reasoning to answer the question
in 1 to 2 sentences. You can earn up to 2 points for a
correct and thorough explanation.

Me! i really need to get this right before 9. prove the divisibility of 7^6+7^5-7^4 by 11. use factoring so you get a number times 11. just tell me the number. i need this done asap

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Math i have no idea how to do a and b