GRE
$$\pi r^2-x$$
$$24$$ times the area of the shaded region $$S$$
$$n$$
$$r$$
$$a$$
$$b+55$$
The total number of different passwords for the computer
30
The standard deviation of the 6 times shown for Tom
The standard deviation of the 8 times shown for Andrew
The number of different values that can be obtained by adding a member of set S to a member of set T
9
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