GRE
$$x^{2} - y^{2}$$
5
$$(27)^{-8}$$
$$(81)^{-6}$$
m + n
2m
The greatest possible value of $$\frac{2}{x-y}$$, where 9≤ x ≤ 12 and -2 ≤ y ≤ 8
2
r+t
12
The number of positive factors of $$pr^{2}$$
The number of positive factors of $$(p+3)(r+3)$$
The remainder when $$7^{13}$$ is divided by 10
7
The average (arithmetic mean) of $$2^{n}$$,$$2^{n+1}$$,$$2^{n+2}$$,$$2^{n+3}$$,$$2^{n+4}$$
The median of $$2^{n}$$,$$2^{n+1}$$,$$2^{n+2}$$,$$2^{n+3}$$,$$2^{n+4}$$
The perimeter of pentagon ABCDE
The perimeter of pentagon MNPOR
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