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What is the 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83

Write as a product: ac^2–ad+c^3–cd–bc^2+bd

Taber invested money in an account where interest is compounded every year.he made no withdrawals or deposits. the function a(t)=525(1+0.05)^t represent the amount of money in the account after t years. how much money did taber origanally invested?