List all possible rational zeros given by the rational zeros theorem

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

What is r i 4.5+10r=-6.5 with work pls

If (x + 8) is a factor of f(x), which of the following must be true? both x = –8 and x = 8 are roots of f(x). neither x = –8 nor x = 8 is a root of f(x). f(–8) = 0 f(8) = 0