7 The dimension you provide is not a squared dimension but a linear dimension. There are no squared dimensions in a linear dimension. There are 7 linear yards in 21 linear feet, but no squared yards.
Cannot answer the question with out the depth dimension. If you are talking about square yards then 20x5 = 100 square feet, divided by 9 = 11.11 square yards,
3456 square yards
You cannot do this. All conversions must be dimensionally consistent. In this case, square yards have the dimension l2 while yards have the dimension l. One measures area and the other measures length. Thus it is impossible to convert between the two.
You need one more piece of information. One other dimension (if a rectangular area), in feet, of the area you are using/measuring. Take "the other dimension in feet" and divide it by 9. Assuming your other dimension is 12 feet, 12/9 = 1.333333, therefore in your case do this 4840/1.333333 = 3630 lineal feet. Warning, this only works on rectangular areas.
Assuming it's a square: 15*15
25.3, computed by multiply each dimension and then dividing by 9 (1 square yard) of by converting the feet measurement to yards dividing each length by 3 (the number of feet in a yard) and then multiplying the two dimension of yards measurement by each other.
You don't. Yard is distance (one dimension) square feet is area (two dimensions).
Area has the dimension of (length)2. So square feet, square yards, square miles, square meters, square centimeters; are all units describing an area. A hectare is an area unit equal to 10000 square meters, and an acre is an area unit equal to 43560 square feet.
I'm guessing it's 1,474.7 square yards then 1,474.7 x 0.5 = 737.35 cu yards if not you need another dimension
No, yards and square yards are not the same. Yards are a unit of linear measurement used to measure length, while square yards are a unit of area used to measure the size of a two-dimensional space. Square yards are calculated by multiplying the length and width of a space measured in yards.
A yard is a length measurement with only one dimension, length. Square feet is a two-dimensional measurement (length and width) and computation. You cannot logically compare yards with square feet.