please find the 4 requirements to this question and attach explanation if possible because I kept getting them wrong for some reason

Campbell, a single taxpayer, earns $434,000 in taxable income and $3,700 in interest from an investment in State of New York bonds. (Use the U.S. tax rate schedule.) Required: a. How much federal tax will she owe? b. What is her average tax rate? c. What is her effective tax rate? d. What is her current marginal tax rate? Complete this question by entering your answers in the tabs below. Req A Red B Reg C Req D How much federal tax will she owe? (Do not round intermediate calculations. Round "Federal tax" to the nearest dollar.) Federal tax 2021 Tax Rate Schedules Individuals Schedule X-Single If taxable income is over:But not over: The tax is: $ 0 $ 9,950 10% of taxable income $ 9,950 $ 40,525 $995 plus 12% of the excess over $9,950 $ 40,525 $ 86,375 $4,664 plus 22% of the excess over $40,525 $ 86,375 $ 164,925 $14,751 plus 24% of the excess over $86,375 $ 164,925 $ 209,425 $33,603 plus 32% of the excess over $164,925 $ 209,425 $ 523,600 $47,843 plus 35% of the excess over $209,425 $ 523,600 $157,804.25 plus 37% of the excess over $523,600