An ellipse has 2 foci. They are the points of the major axis which are at distance $a$ from the intersection between the minor axis and the ellipse. The distance between the foci and the center is then called the linear eccentricity $f$.
Find Your Surgeon. Find Your Surgeon. The average cost of laser skin resurfacing is $2,222 for ablative and $1,113 for non-ablative, according to ASPS 2012 statistics. The cost of laser skin resurfacing may vary, and the aforementioned fees are the national average surgeon/physician fee only.ind Your Surgeon. The average cost of laser skin resurfacing is $2,222 for ablative and $1,113 for non-ablative, according to ASPS 2012 statistics.
Concrete Resurfacing Cost. Typical costs: Expect to pay a resurfacing contractor $3-$10 a square foot depending on the condition of the existing concrete, the resurfacing system used and local rates. Small residential projects tend to cost more per square foot and may be subject to a minimum charge of $500-$1,000 or more. Resurfacing an average 500-square-foot concrete driveway typically costs $2,000-$5,000.