Discussion
Two lines intersect at a point. If one pair of vertically opposite angles are (3x - 10)° and (2x + 15)°, find the value of x.
Answer: C
Vertically opposite angles are equal.
\[ 3x - 10 = 2x + 15 \quad\Longrightarrow\quad x = 25 \]
Both angles then measure 65°, as they must.
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