kenziieann kenziieann

29-06-2017
Mathematics

contestada

i cant figure out how to do this i keep getting the wrong answer

i cant figure out how to do this i keep getting the wrong answer class=

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JohnLayton JohnLayton

29-06-2017

The formula for the secants of a circle is, in this case, (AB + BC) x BC = (ED + DC) x DC. After plugging in the known values we get: (ED + 10) x 10 = 420. Next, we can solve and get: ED = 32. Finally, we add up ED and DC and get a final answer of D. 42.

Hope this helps!

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