I’m rlly confused pls helpp

Is the following relation a function? x y 1 4 −1 −2 3 10 5 16 yes no

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 .

If sin(x) = 0 and cos(x) = 1, what is tan(x)?