## Introductory Algebra for College Students (7th Edition)

$\frac{9}{7}$
Divide the monomials by cancelling out common factors of the numbers and subtracting the exponents of variables. $\frac{9x^{20}y^{20}}{7x^{20}y^{20}}$=$\frac{9}{7}$x$^{(20-20)}$y$^{(20-20)}$=$\frac{9}{7}$x$^0$y$^0$=$\frac{9}{7}$ Check the answer. 7x$^{20}$y$^{20}$($\frac{9}{7}$)=$\frac{7(9)}{7}$x$^{20}$y$^{20}$=9x$^{20}$y$^{20}$