In circle O shown, chords AB and CD intersect at E such that AE=10 and EB=12. if ED=6 , then which of the following is the length of CD ? 1.) 26
2.) 24
3.) 20
4.) 18

Long division setup showing an incomplete calculation. 12 is in the divisor, 6839 is in the dividend, and 5 hundreds and 6 tens is written in the quotient. 6000 is subtracted from 6839 to give 839. an unknown value represented by a box is being subtracted from 839. what number should be placed in the box to complete the division calculation?