Find the center and the radius of the given circle. X^2+y^2=25

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

I’m really confused and need your assist me with this question i’ve never been taught

3x = 729 solve for x plz . it's urgent. will mark