In which of the following division problems, the quotient is not a polynomial.
(a) r^4y - 2x^3y^2+ x^5y^5 by x^2y
(b) – 10x^3y² +15x^2y^3 - 5x²y^3 by -5/2x^2y^2
(c) 4x²y - 7xy² - y^2 by
-x^2y^2​

The stem-and-leaf plot shows the heights in centimeters of teddy bear sunflowers grown in two different types of soil. soil a soil b 5 9 5 2 1 1 6 3 9 5 1 0 7 0 2 3 6 7 8 2 1 8 3 0 9 key: 9|6 means 69 key: 5|8 means 58 calculate the mean of each data set. calculate the mean absolute deviation (mad) of each data set. which set is more variable? how do you know?