Bc¯¯¯¯¯ is parallel to de¯¯¯¯¯. what is ab? enter your answer in the box. units an upside down triangle with vertices labeled as a, d, and e. side d e is the base and the bottom vertex is a. sides a d and a e contain midpoints b and c, respectively. a line segment is drawn from b to c parallel to the base. segment b d is labeled as 17. segment a c is labeled as 42. segment c e is labeled as 21.

I believe the answer is 34.

34

Step-by-step explanation:

The ratio of AB to BD will be the same as the ratio of AC to CE.

The ratio of AC to CE is 42/21.

AB is unknown.  Using the variable x to represent AB, we have the ratio x/17.

This gives us the proportion

42/21 = x/17

Cross multiplying, we have

42(17) = 21(x)

714 = 21x

Dividing both sides by 21,

714/21 = 21x/21

34 = x

{3 + i, 3 - i, 3, -1}

step-by-step explanation:

0.32

step-by-step explanation:

2.24/7