t(i, d) dollars is the federal income tax owed by a person who made i dollars and can claim d dependents in a given year. When 2 dependents can be claimed and income is changing, how quickly is the amount of taxes owed changing? (a) Write the mathematical notation for the partial rate-of-change function needed to answer the question posed. ? (b) Write the units of measure for that rate-of-change function. O income dollars O tax dollars per income dollar O income dollars per tax dollar O tax dollars per dependent O income dollars per dependent

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