That will completely and entirely depend on the area of the back yard ...
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at least 40 pounds of fertilizer is needed to adequately cover your backyard. let f= the amount of fertilizer needed
144 Get 160 to be safe.
72 Get 80 to be safe.
To determine how many 12 by 12 inch pavers are needed to cover 320 square feet, first convert the dimensions of the paver to square feet: a 12 by 12 inch paver is 1 square foot. Therefore, to cover 320 square feet, you would need 320 pavers, since each paver covers 1 square foot.
4.5 pavers will cover 1 sq foot. So 4.5 x 360 =1620 pavers
To determine how many brick pavers are needed to cover a 12 x 14 area, first calculate the area in square feet: 12 feet x 14 feet = 168 square feet. Next, find out the size of the brick pavers, as this will affect the total number needed. For example, if each paver is 1 square foot, you would need 168 pavers; if they are smaller, divide the total area by the size of one paver to find the exact number needed.
72 Get 80 to be safe.
101.25 pavers
153.84 pavers
144.63 pavers
you would need 10 pavers to cover this area if the pavers are 1x1 ..most pavers are not this large they are usually 2x4. I would recommend buying a couple of extra pavers so that you can have cuts instead of all the pavers being the same size.
To determine how many 8x16 pavers are needed for 252 feet, first convert the dimensions of the pavers into feet: 8 inches is 0.67 feet and 16 inches is 1.33 feet. The area of one paver is 0.67 feet x 1.33 feet = 0.89 square feet. To cover 252 square feet, you would divide 252 by 0.89, resulting in approximately 283 pavers needed.