What is the size of the matrix resulting from [4 -1 0]*[2 1 0 -3 -7 2 1 -5 2]

1. are the triangles similar and if so why? what is the value of x? show your work.

Select the correct answer. in the figure, angle k measures 45°. what is the measurement of angle c? a. 38° b. 45° c. 90° d. 98°

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?