- 4r-9=3 r= ?

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Can momentum exist without a mass, if photon particle of light have no mass or volume how can they have momentum? How to make b the subject is the question is a = 1/4 b? Y=x2+4x−5 1. Transpose the c -value to the left side of the equation.? 77=7e^0.02t? A typical bacterial cell increases from one cell to 512 cells in 10 hours. What is the generation time of this bacterium?