A rectangle is a .

square
parallelogram
quadrilateral
rhombus

Solve 2x+y=3 x+y=5 in substitution method

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 .

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