Write a system of equations to represent the situation below. Then solve the system and answer the question fully. A total of 243 adults and children are at a movie theater. There are 109 more adults than children in the theater. How many children's tickets were sold?

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 .