Find the value of x Look at the picture^^

Answer with work please I need help???

Don’t mind the work in the box I didn’t have space for it on the other question.

What is the slope of the line shown below?

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

In the diagram of circle o, what is the measure of zabc?