Given tan(a) = 2 and a is in quadrant i, find tan(2a). -1/3 2/3 -4/3 -2/3

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?

If rt is greater than ba, which statement must be true ?

Hundred and tens tables to make 430 in five different ways