Of the 8760 hours in a year, one television was on for2628hours. what percent is this?

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 .

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Simplify the algebraic expression 8y-2(y+4)