Find the 87th term of this sequence: 157, 150, 143, ...

Y=4x^2+x-1 solve using quadratic formula

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At the beginning of year 1, carlos invests $600 at an annual compound interest rate of 4%. he makes no deposits to or withdrawals from the account. which explicit formula can be used to find the account's balance at the beginning of year 5? what is, the balance?