- What is the time required to reached the maximum height?

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Can someone help me with this proof about injectivity/surjectivity? If A and B are 4x4 matrices, det(A) = -2, det(B) = 6, then what is det(2A)? How to do 3b? The number of tetrahedral void for atom in crystal lattice is? How many moles of fluorine are required to produce 12 grams of KrF6? Given the equation Kr+3F2=KrF6?