Answer:
To simplify (4x^2)/(7y^2) and (21y^3)/(20x^4), we need to simplify each fraction separately.
(4x^2)/(7y^2) can be simplified by dividing both the numerator and denominator by their greatest common factor, which is 1:
(4x^2)/(7y^2) = 4x^2/7y^2
(21y^3)/(20x^4) can also be simplified by dividing both the numerator and denominator by their greatest common factor, which is 1:
(21y^3)/(20x^4) = 21y^3/20x^4
So the simplified fractions are 4x^2/7y^2 and 21y^3/20x^4, respectively.
Explanation: