The distance by road from town A to town B is 257 km. What is 50% of that distance?

1. what is the formula for finding the vertical distance between two points on a coordinate plane?

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

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?