L=3 1/2 w=3 1/4 h= 3cm find the surface area of the prism an the volume

What is best way to getting answer for my exam is

Simply 8x squared + 5(7x squared- x) - 2x =

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?