The image you uploaded contains a series of mathematical vector problems related to a parallelogram. Here's a breakdown of the tasks presented:

1.1 Problem

The first question is asking which of the following vector relationships is true, specifically focusing on the vectors of the parallelogram.

• Options:
  • $DA = b$
  • $AD = b$
  • $CA = d$
  • $DC = a$

1.2 Problem

This question is asking which of the vector equations is correct for the vector $d$.

• Options:
  • $d = a + b$
  • $d = a - b$
  • $d = -a + b$
  • $d = -a - b$

1.3 Problem

The final question asks you to determine the coordinates of vector $\vec{b}$, given the points $B(6; 2)$ and $C(8; 6)$.

I can help you solve these questions step-by-step. Would you like to proceed with the first question, or do you want to start with a different one?