Which arrangement for these numbers is from least to greatest? a. -4/5, -7/9, -5/8, -3/7  b. -4/5, -5/8, -7/9, -3/7c. -7/9, -5/8, -3/7, -4/5d. -3/7, -4/5, -5/8, -7/9,

The easiest way to do this is to find a common denominator among all those denominators.  Multiplying all those together gives you 2520.  So now just get the equivalent numerator that goes along with it.  -5/8 = -1575/2520; -7/9 = -1960/2520; -4/5 = -2016/2520; -3/7 = -1080/2520.  Of course the least of these is the one that is most negative, which is the equivalent of -4/5.  Next would be the equivalent of -7/9. Next is -5/8, and lastly, -3/7.  So your choice is a.