Help pls? i really need help 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

Find the rate of change for the situation. you run 7 miles in one hour and 21 miles in three hours.

What ratio is proportional to 18/21