Indira withdrew 20 dollars from her account every day for 5 days, then deposited 45 dollars into the account. Which expression represents the change in the amount in her account?

Each withdrawal decreases the account by $20, so five withdrawals represent a change of −20 × 5. The $45 deposit increases the account, so add 45. The expression is −20 × 5 + 45, which is choice C.

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