A parent-teacher committee consisting of 4 people is to be formed from 21 parents and 5 teachers. Find the probability that the committee will consist of all teachers.

Shryia read a 481 -page-long book cover to cover in a single session, at a constant rate. after reading for 1.5 hours, she had 403 pages left to read. how fast was shryia reading? pages per hour how long did it take her to read the entire book? hours plz i realy need this

Sketch one cycle if the cosine function y=2cos2theta

How can you tell when x and y are not directly proportional?