How do i simplify 12/15, 48/56, 28/36, and 15/40

12/15 divide both by 3=4/5
48/56  divide both by 8  =6/7
28/36    divide by 4  = 7/9

15/40 divide by 5 = 3/8

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.