Line segment ab measures 18 units. what is d, the distance between tick marks on the number line? 1 unit 2 units 3 units 9 units

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?

Write an expression that has three terms and simplifies to 4x - 7. identify the coefficient(s) and constant(s) in your expression

Find the midpoint m of z1=(8+5i) and z2=(12+3i)