Class A is Lowest Efficiency
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a=7 b=9 ab=? ab is the multiplication of a & b there fore the value of ab=7*9=63
8.8 Units
(ab) raised to 1/2 power
If 2 segments have the same length they are known as 'congruent segments' IE: segment AB=segment AC (or AB=AC) then AB @ AC (or AB is congruent to AC)
AB can be found by using the distance formula, which is the square root of (x2-x1)^2 + (y2-y1)^2. In this case, AB= the square root of (-2-(-8))^2 + (-4-(-4))^2 which AB= the square root of 64 + 0 which AB=8.