In december it snowed 3 4/5 inches.in january it snowed 4 1/4 inches.what is the combined amount of snow for december and january

Sorry i messed up the answer and can delete 

Turn 3 4/5 into 3 16/20, and 4 1/4 into 5/20 then add, 7 21/20 = 8 1/20 in. (I'm pretty sure)

These are the steps:
1. Find the area of the trapezium {Whole figure).
2. FInd the area of the rectangle (unshaded).
3. Area of the shaded = Area of trapezium - Area of the rectangle.

Step 1:  Find the area of the trapezium:

Formula : Area of trapezium = 1/2 (a + b)h 

Area = 1/2 ( 25 + 15) (12) = 240 yd²

Step 2 : Find the area of the rectangle:

Formula : Area = Length x Width

Area = 12 x 3 = 36 yd²

Step 3: Find the shaded region:

240 - 36 = 204 yd²

204 yd²