If both skilled workers and technicians received a raise of $0.50 and $0.70 respectively, what is the increase in the weighted average of all wages paid by the firm?

A)$0.29
B)$0.42
C)$0.58
D)$0.60

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?

Can someone me and do the problem plz so i can understand it more better

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?