Evaluate the expression when a=-18 and b= -6
b to the power of 2 divided by a plus 4

What are the relative frequencies to the nearest hundredth of the columns of the two-way table?

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?

Asphere has a diameter of 10 in. what is the volume of the sphere?