5. A certain radioactive isotope has a halfilife of 11 days. If one is to make a table showing the halfilife decay of a sample of this isotope from 32 grams to 1 gram; list the time (in days, starting with t : 0) in the first column and the mass remaining (in grams) in the second column, which type of sequence is used in the first column and which type of sequence is used in the second column? (2 points) 18. Determine if the graph is symmetric about the x-axis, the y-axis, or the origin. r = 4 - 4 cos 0 (1 point) No symmetry x-axis only y-axis only O Origin only