Given the parent function of f(x) = x4, what change will occur when the function is changed to f(−2x)? graph opens the same way and is narrower graph opens the same way and is wider graph opens the opposite way and is narrower graph opens the opposite way and is wider

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?