Answer:
C. 10.5
Explanation:
Intersecting chords theorem
If two chords intersect in a circle, the products of the measures of the segments of the chords are equal.
⇒ 15 · 7 = 10 · x
⇒ 105 = 10x
⇒ x = 105 ÷ 10
⇒ x = 10.5
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