Astudent said that 3x and 4y can be simplified to 7xy by combing like terms. what error did the student make?

Find the equation of the trend line (line of best fit). show your work i'm using the points (34,76) (42,91)

Ivan and jeff buy a package of 8 pens for $4.00. ivan wants 5 of the pens, and jeff wants 3.how much should each student pay?

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?