Y^-9/y^-2

Rewrite with a positive exponent only

To rewrite the expression with a positive exponent only, we can multiply the numerator and denominator by y^2:

(Y^-9 * y^2) / (y^-2 * y^2)

Now, we simplify each term:

Y^-9 * y^2 = Y^-7
y^-2 * y^2 = y^0 = 1

Thus, the expression can be rewritten as:

Y^-7 / 1 = Y^-7