Graph the set of points which model is most appropriate for the set

On a piece of paper graph f(x)=5•(0.4)^x

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

Miranda is braiding her hair. then she will attach beads to the braid. she wants 1_3 of the beads to be red. if the greatest number of beads that will fit on the braid is 12,what other fractions could represent the part of the beads that are red?