What is the next 3 term sequence for 1,3,7,13,21 how do you solve it

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

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

What is always true about a positive integer raised to a negative odd power?