GRE
$$\frac{w+z}{2}$$
$$x+\frac{z-y}{2}$$
$$(\frac{1}{x}-\frac{1}{y})^{-1}$$
$$(\frac{1}{y}-\frac{1}{z})^{-1}$$
The average (arithmetic mean) of the numbers x, -x, and |x|
x
$$x$$
30
x+y
x+1
r
s
$$x^{y}$$
$$y^{x}$$
The measure of angle $$ABC$$
$$60°$$
s+3
t
The length of the third side of the triangle
11
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