Need with this problem, . the sum of three numbers is -3. the last number is three times the first. the last number is 11 smaller than the second number. what are the three numbers?

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?

If the measure of angle 1 is 110 degrees and the measure of angle 3 is (2 x+10 degree), what is the value of x?

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