Acopper block weighs 1,142 g. its dimensions are 8 cm by 4 cm by 4 cm. to the nearest hundredth, what is the density of copper?

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?

A25- foot ladder leans against a building and reaches a point of 23.5 feet above the ground .find the angle that the ladder makes with the building

Are the corresponding angles congruent? explain why or why not.