What is the coefficient of a ^ 5 * b ^ 5 in the expansion of (a + b) ^ 10 ?

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?

Need showing work for this problem 56.25 ×25.80

Which of the following represents the length of a diagonal of this trapezoid?