For its standard checking account, Northwest bank charges a monthly fee of $2.50 plus $0.10 per check. The function used to determine total monthly charges is C=$ 2.50 + $0.10n, where C = monthly charges and n= the number of checks.

C = $2.50 + $0.10n

Here n is the number of checks, As given She wrote one check in the month then n = 1,

C = $2.50 + $0.10(1) = $2.60

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