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Table tennis question

Which matrix multiplication is possible?

Given that ot =5, xt=12, and ox= 13 is xy tangent to circle o at t? explain.

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 .