Please help me with the question in the image below. Use the Diagram? Please help! Thanks :) The question is: Find the length of the segment?

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

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?

Find │–14│ a. 14 b. –14 c. start fraction 1 over 14 end fraction