GRE
$$\frac{a}{c}$$
$$\frac{(a+k)}{(c+k)}$$
(x+1)@
$$x^{2}$$
c@3, where c > 3
3
The slope of the line m
-$$\frac{1}{2}$$
The slope of line L
$$\frac{4}{5}$$
$$\frac{1}{2}$$
The slope of the line l
$$\frac{10}{9}$$
The slope of line m that is perpendicular with line l
-1
The distance between the origin and (x, y)
The distance between the origin and(1-x,1-y)
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