What is the sum of. -6n + 3 and 4n -9 please help

If eh = hg and hg=16, find the diameter of k

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?

Alogical argument that is presented in graphical form using boxes and arrows is called?