First find the Interquartile range. To find the interquartile range you would have to subtract the third quartile by the first quartile. So for Town A 30-15=15 and then for Town B 40-20=20.
an = 2 an-1 means that each term in the sequence( except the first) is obtained by multiplying the last term by 2, so the first 4 terms are m, 2m, 4m, 8m.
