Which of the following is a true statement about functions? A. If fand g are functions, then (tog)(x)=(g f)(x) . B. If fand g are functions, then (f + g)(x) = (g + f)(x) If fand g are functions, then (f - g)(x) = (g - f)(x) D. If fis a function , then (f(x + 2))/(g(x)) = (g(x))/(f(x + 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?