(d) is the correct answer.
First Answer and Last Answer are correct.
The two middle should be reconsidered, you can't really tell if they are technically Perpendicular.
So the correct answer should be "Can't be determined" for the middle two.
Answer:
8
Step-by-step explanation:
Since this isosceles triangle has been broken down into two right triangles, and we already know that two sides are the exact same (note that there are 2 x's) that means BD and BC are going to be the exact same length. Since BD is 4, that means BC will be 4, and that means

Hope this helped!