Please help using college algebra physics please show all work and equations used thanks.

1) Unpolarized light of intensity 215 W/m falls on a polarization filter that is oriented fully vertical. After the first filter there are a number of polarization filters with their polarizations set to 55.00 from the previous filter's orientation. How many TOTAL filters (including the first one that the unpolarized light falls on) are needed to reduce the intensity to approximately 11.6 W/m