An industrial waste duct is graded at 25 percent It begins a

An industrial waste duct is graded at 2.5 percent. It begins a 29-foot run at an elevation of 81.5 feet and ends at a waste holding tank. What will the elevation of the pipe be at the holding tank? A.69.9 feet B.80.5 feet C.80.8 feet D.82.2 feet

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The smaller, inner bank had a mean diameter of ~318 ft. A gap in the inner bank on the axis, housed a second pair of large stones. Only the fallen Slaughter stone remains. The positions of these stones in relation to other features will be discussed in later sections. Within the inner bank the builders constructed an accurate circle of some 56 equally spaced holes. The primary excavator Richard Atkinson, gave the Aubrey (outside?) diameter as 288 ft. However more recently the Department of The Environment using the master plan of the site found a mean radius of 140.3 + / - 1.8 ft. The author has checked this on opposite stone pairs and found the same : a diameter of about 280-282 ft. These Aubrey holes averaged 3 ft in diameter and 3 ft in depth. This feature is the famous Aubrey circle which is the key to later construction (Figure 1). The various polygons we will use are scaled to the Aubrey diameter and properties of these polygons will be found to correspond closely to monument dimensions. The estimate of 280 -282 ft. cannot be too far off. It was said that the holes never held (permanent) stones but this has recently been disputed. It is now said the holes held substantial posts (35). This change actually enhances the practical use of the Aubrey circle for counting astronomical cycles or as a protractor for angular measurements. Why were the banks and circle built to these diameters ? General scaling ‘laws’ we will come to later. Are the circles related in any way ? Let us see. outer bank / inner bank = 379.5 / 318 = 1.1934 outer bank / Aubrey = 379.5 / 280.6 = 1.3525 Inner bank / Aubrey = 318 / 280.6 = 1.133 The mean ditch diameter is also very closely mean bank diameter at 348.75 ft (and 161.2 megalithic rods or 100 x phi almost exactly).