Write 1/2 the difference of a number and 15 as an algebraic expression : ) answer asap pls! worth 50 points and i will reward you brainliest (if you answer correct)

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?

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?

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')