Need help asap! thank u

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

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x