- MAth Help: a number divided by -3 is equal to -2.8?

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Find a basis of the subspace of R4 that consists of all vectors perpendicular to both [1,0,0,7] and [0,1,-9,5]. Please show work!? Calculus help? limit as x approaches negative infinity of (sqrt(9x^2+x)) -3x? What is the reason behind simplifying a fraction? please explain, thank you? Ho wma y kilometers run after 22 minutes? How do I determine all values of theta for 0