To find the number of cups of sugar Sonya uses to bake 9 batches of cookies, we can use the equation provided in the table: Number of cups of sugar = 2 * Number of batches. Plugging in n = 9, we get 2 * 9 = 18 cups of sugar.
To find the number of cups of sugar Sonya uses to bake 3 batches of cookies, we can use the same equation: Number of cups of sugar = 2 * Number of batches. Plugging in n = 3, we get 2 * 3 = 6 cups of sugar.
Therefore, Sonya uses 18 - 6 = 12 more cups of sugar to bake 9 batches of cookies than to bake 3 batches of cookies.