GRE
$$\frac{1}{x}$$+$$\frac{1}{y}$$
$$x+y$$
The standard deviation of the original 5 prices
The standard deviation of the resulting 5 prices after the 3 prices decreased
The remainder when k is divided by 7
The remainder when 2k is divided by 7
The remainder when N is divided by 11
9
|$$m$$| - |-$$k$$|
|$$k$$| - |-$$m$$|
$$x^{-3}$$+$$y^{-3}$$
$$(x+y)^{-3}$$
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