A car travels 400 km in 5 hours (with a
constant speed). How far can it travel in
3 hours (with the same speed)?

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