GRE- Quantitative Reasoning
triangles formed by the runways. The interior angle formed by the 120?- turn from runway 1 to 2
is 60? (a 180?-turn would reverse the airplane's direction). Similarly, the interior angle formed by
the 135?- turn from runway 1 to 3 is 45? (180? - 135?). Two right-triangle "angle triplets" emerge:
a 45?-45?-90? triplet and a 30?-60?-90? triplet, as shown in the figure below. Since the sum of
any triangle's interior angles is 180?, the remaining angles can also be determined:
Among the three Roman-numeral choices, only I and III provide angles shown in the figure
above.

QUESTION: 17
In a geometric sequence, each term is a constant multiple of the preceding one. If the first three
terms in a geometric sequence are 22, x, and 28, which of the following could be the sixth term
in the sequence?

A. 512
B. 256
C. 64
D. -17
E. -128

Answer(s): C

QUESTION: 18

A certain line on the xy-plane contains the (x, y) points (-2, 1) and (3, 5). What is the slope of the
line?

Express your answer as a simple fraction. To indicate a negative fraction, enter a dash (minus
sign) before either the numerator number or the denominator number.

Answer(s): 4/5
Explanation: (Enter 4 in the upper box and 5 in the lower box.) The line has a slope of

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