In rhombus abcd, diagonals ac and bd meet at point e. if the measure of angle dab is 46 degrees, find the length of eb.

There is no way to get an exact answer. It could be a really small rhombus, or a huge one, and still have a 46º angle there. You need at least one length of a segment. 

Your problem could have errors that's why it can't be solved. You do not have to worry because it happens sometimes. 

I hope it helps you.