There are 40*3*4 = 480 cubic feet.
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To calculate the volume of concrete needed for the sidewalk, first convert the 4 inches thickness to feet (4 inches = 1/3 feet). Then, multiply the length (40 ft) by the width (3 ft) by the thickness in feet (1/3 ft) to get the total volume in cubic feet. This comes out to be 40 ft * 3 ft * 1/3 ft = 40 cubic feet of concrete needed for the sidewalk.
There are 0.13368 cubic feet in a gallon.
You would need 1,260 cubic feet of mulch to cover an area of 28 x 45 feet. This is calculated by multiplying the length (28 ft) by the width (45 ft) to get the total square footage (1,260 sq ft) and then multiplying by the desired depth of mulch.
To convert square feet to cubic feet, you need to know the height or depth of the area. If the height is 10 feet, then 160 square feet would equal 1600 cubic feet (160 sq ft x 10 ft = 1600 cu ft).
That is 27 cubic ft.