I can see that you've uploaded a math worksheet with various geometric problems involving right triangles, angles, and other calculations. Let me extract and analyze the problems one by one to solve them. I'll provide a detailed explanation for each.

Problem Breakdown:

1. Problem 1: Find $BC$ (in the first triangle with a 60° angle).
2. Problem 2: Find $AB$ (in the second triangle with angles 45° and 45°).
3. Problem 3: Triangle marked with $AC = CB$, find angle $\angle CBE$.
4. Problem 4: Find angles $\angle B$ and $\angle D$ in the triangle with given sides $3.5$ and $?$.
5. Problem 5: Find $CE$ and $PC$ (with $150°$ angle labeled).
6. Problem 6: Find $CD$ in the right triangle where $AB = 20$.
7. Problem 7: Find $\angle MCA$ (triangle with right angle at $A$).
8. Problem 8: Find angles $\angle A$ and $\angle ABC$ (given $\angle ABC = 25°$).

Would you like me to work on all the problems in sequence, or do you have a specific one in mind to prioritize?