At an electronic store, an air conditioner marked at 280$ was on sale at $259 what was the percentage of discount for the air conditioner?

Which one ? is the answer and how to find this answer

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12

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?