Please help me with Problems #'s (5-8) would really appreciate it, and will give Brainliest.

(Algebra)

2(n-1)+4n=2(3n-1)n=0no solutioninfinitely many solutions n= - 4 !

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?

Asunflower was 20 1/2 inches tall. over the next 6 months, it grew to a height of 37 inches tall. what was the average yearly growth rate of the height of the plzzz write a proportion i will give you 100 points