Rewrite the expression. use an exponents, (-) simplify show your work

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

If the wwight of a package is multiplied by 7/10 the result is 65.8 find the weight of the package

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?