Let u =<-2,4>, v= <1,-3>. Find the component form of the vector 2u-3v. please help me plss

What are “like terms”? why can we only add like terms?

Icould really use some with this question.

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 .