FORMULAS
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Circle Equation: center at the origin or (0,0)
x^2+y^2=r^2
Circle Equation: if center is at (h,k)

(x-h)^2+(y-k)^2=r^2



STANDARD FORM


(X=-B(+ OR -) square root of b^2-4ac)/(2a)

substitute values of a,b and c to the quadratic formula


ARITHMETIC SERIES FORMULAS
1.-------a sub n=a sub 1+(n-1)d
2.-------S sub n=n/2(a sub 1+ a sub n)


GEOMETRIC SERIES
1.------S sub n=(a sub 1 - a ^r^n)/(1-r)
2.------S sub n=(a sub 1(1-r^n))/(1-r)
3.------S sub n=(a sub 1 - a sub n^r)/(1-r)