(a) The double-angle identity allows us to rewrite the expression sin(2x). To establish this identity, we begin with a previously verified identity. Which identity do we use?

Which conjunction is disjunction is equivalent to the given absolute value inequality? |x+2|< 18

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?

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?