Which of the following is true about REM sleep? A. it is when most dream occur
B. It involves a lot of movement and thrashing as people have vivid dreams
C. It is the stage of sleep in which the heart beats the slowest
D. It is a much deeper, more restful kind of sleep than non-REM sleep

To solve this integral, what you can do is split it up as follows: (1) ∫40(x2−4)dx=∫40(x2)dx−∫40(4)dx. to integrate  4  as an  indefinite integral, a good rule of thumb is  by  an equation below  for  polynomials; . (2) ∫xa=xa+1a+1+c , where a is any number. c denotes some constant that is crucial when doing