Sarah can assemble a wideget in 8 hours. jerry can do the same job in 12 hours. how much time would be required to assemble a widget if they worked together?

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