Me to solve this pls

km and nm

Which number produces a rationale number when multiplied by 1/5

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 .

9/10 divide by -3/15 as a mixed number