16) 9a^2bc^4/15ab^3c^5
To simplify this expression, we can cancel out common factors between the numerator and denominator:
9a^2bc^4/15ab^3c^5 = (3^2 * a^2 * b * c^4) / (5 * a * b^3 * c^5)
= (3/5) * a^(2-1) * b^(1-3) * c^(4-5)
= (3/5) * a * b^(-2) * c^(-1)
= 3a / (5b^2c)
17)9x^4y^3/3x^10y^7
Similarly, we can cancel out common factors to simplify this expression:
9x^4y^3/3x^10y^7 = (3^1 * 3^2 * x^4 * y^3) / (3^1 * x^10 * y^7)
= 3^(2-1) * x^(4-10) * y^(3-7)
= 3 * x^(-6) * y^(-4)
= 3 / (x^6y^4)