I don’t know why I cant understand this

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

In which form is the following function written? y = - 2(x – 3)(x + 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 .