The graph of the function y= x^2-x-2 is shown below which of the following shows the correct key features of the graph

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?

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

Ineed to know the answer to this algebra question.