D) A rectangular garden has a width of 1.2 meters and a length of 3.5 meters. For each square meter of space in the garden, Leo needs to use 0.075 kilogram of fertilizer. He finds the total amount of fertilizer needed for the garden using the work below. Leo is incorrect. Use the drop-down menus to explain Leo's mistake and the actual amount of fertilizer needed for the garden. Area of the Garden Amount of Fertilizer 1.2 x 3.5 60 + 360 4.2 X 0.075 21 0 + 2940 0.2 150 4.2 0​

Leo's mistake is in the calculation of the area of the garden. He multiplies 1.2 meters by 3.5 meters to get 4.2 square meters.

The actual calculation for the area of the garden should be length times width, which is 3.5 meters times 1.2 meters. This equals 4.2 square meters.

Therefore, the actual amount of fertilizer needed for the garden is 4.2 square meters multiplied by 0.075 kilograms per square meter, which equals 0.315 kilograms or 315 grams of fertilizer.

Leo's mistake is in the calculation of the area of the garden. The correct area is 1.2 x 3.5 = 4.2 square meters. However, Leo incorrectly calculated it as 1.2 + 3.5 = 4.7 square meters.

The actual amount of fertilizer needed for the garden is the correct area (4.2 square meters) multiplied by the amount of fertilizer needed per square meter (0.075 kilograms). Therefore, the actual amount of fertilizer needed for the garden is 4.2 x 0.075 = 0.315 kilograms.