Combine the like terms to create an equivalent expression:
{8n+12+(-9)-(-6n)}8n+12+(−9)−(−6n)

If eh = hg and hg=16, find the diameter of k

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?

What is the ratio for the surface areas of the cones shown below, given that they are similar and that the ratio of their radil and altitudes is 4: 3? 23