Ok I’m back again but what % of 100 is 7.7

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?

Give all possible names for the line shown.calculation tip: lines can be written with either point first.

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)