Consider the following pair of equations:
x + y = −2
y = 2x + 10
if the two equations are graphed, at what point do the lines representing the two equations intersect?
(−4, 2)
(4, 2)
(−2, 4)
(2, 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?

A50% increase followed by 33 1/2% decrease

Which of the following would be a reasonable estimate for the weight of a pencil? a. 1 × 10^-20 lb b. 1 × 10^20 lb c. 1 × 10^2 lb d. 1 × 10^-2 lb