What is the equation of the following direct variation?

y = -2x

y = -1/2x

y = 2x

y = 1/2x

explanation as well

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?

Which shows one way to determine the factors of 4x3 + x2 – 8x – 2 by grouping?

Julian wrote the following numeric pattern on the board3,10,17,24,31,38.what numbers of julian's pattern are compound numbers.