+273 Points a, b, c, and d lie on a line, in that order. If ab = 2 units, bc=5 units and ad=14 units, what is the ratio of ac to bd? Express your answer as a common fraction.
+36916 Draw a number line
put a at zero
put b at 2
put c at 7
put d at 14
now you should be able to work out the ratio easily....
