Answer:
A
Explanation:
given 2 intersecting chords TN and YM , then
the product of the measures of the parts of one chord is equal to the product of the measures of the parts of the other chord, that is
TH × NH = MH × YH ( substitute values )
8(x + 20) = 12 × 20 = 240 ( divide both sides by 8 )
x + 20 = 30 ( subtract 20 from both sides )
x = 10