What kind of tax system does the United States use? A. flat tax system B. progressive tax system C. proportional tax system D. regressive tax system

6(2x + 5y)6 (2x) = 12x6 (5y) = 30y12x + 30y

For a 0.25 pfor b o.3pp (0.25+0.3)=0.28

1.   an exact solution requires a radical solution - no decimal approximation.2. (a)4x^3 = 756x^3 = 756/4 = 189x =   cube root of 189 =   5.74   to nearest hundredth answer(b)   189 = 3*3*3*7   so we can write the cube root of 189 as 3∛7 answerchecking (a) 4*(5.74^3 =   756.48   which is very close(b)   4* ((3∛3)^3   = 4*189   = 756   - spot on! 3. i would use solution b because the original question asked for an exact solution.