Abuilding that is 25 meters tall casts a shadow that is 6 meters long. at the same time, a tree cast a shadow that is 4 meters long. how tall is the tree? (freshman highschool math problem)

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?

{0,1,2,3,4,5,6,20,21,22,23,24,25} the distribution is considered to be: skewed the right, skewed the left, not skewed?

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?