1
circle or write down the number in each list which is not a multiple of the first number listed.
a 3, 6, 9, 12, 14, 18, 21
b 11, 22, 33, 45, 55, 66
c 21.43.63, 84, 105
d 13, 26, 40.52, 65.

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .