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A coefficient is a number that accompanies a variable. For example, in the expression 2x + 4, the coefficient is 2.
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Area = 4*pi*r^2
square root of (5-9)^2+(1+6)^2
If you mean points of: (2, 5) and (-4, 8) Distance is the square root of (2--4)^2+(5-8)^2 = 6.708 rounded