GRE
The area of triangular region ABG
$$\frac{1}{4}$$ of the area of triangular region ACE
$$t+9$$
$$m+13$$
$$z$$
$$2y$$
$$r+s$$
$$0$$
$$n$$
$$3,000$$
The total area of the regions shaded black
The total area of the regions shaded gray
The probability that Dana will not get a busy signal in each of 4 different attempts to telephone Carla
$$\frac{1}{4}$$
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