Federal Tax Income Precalc Questions Part 2 Part 3 The amount of federal income tax ^x) an individual owed in 2003 is given by 0.10 if 0 x 7,000 0.15x 7,000)+700 if 7,000 x Solution part a ) individual whose income was $ 57100 T(x) = 0.25 ( x - 28400 ) + 3910 T(x) = 11085 option a is correct b) domain is all x values for which the function exists domain is [ 0 , 319,100] option a is correct c) t(x) = 0.28 ( x - 71950 ) + 14626 plugging x = 122550 T(x) = 0.28 ( 122550 - 71950 ) + 14626 T(x) = 28794 option e is correct.