I need help with this now, and only answer if you know what your doing and you actually know the )

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?

Find the cosine function that is represented in the graph.

Bring the fraction a/a-4 to a denominator of 16-a^2