Determine the value of r so that a line through the points (r,3) and (5,-4) has a slope of -1/2

Read the following two statements. then use the law of syllogism to draw a conclusion. if the tv is too loud, then it will give me a headache. if i have a headache, then i will have to rest.

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?

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.