if vector B is added to vector A, the resultant vector has x and y components 6 and 1 respectively. when A is subtracted from vector B ,the resultant vector has x and y components of -4 and 7 respectively. what is the magnitude and direction of A​

Ahypothetical metal has an orthorhombic unit cell for which the a, b, and c lattice parameters are 0.413 nm, 0.665 nm, and 0.876 nm, respectively. (a) if there are 8 atoms per unit cell and the atomic packing factor is 0.536, determine the atomic radius (in nm). (b) if the density is 3.99 g/cm3, calculate the metal's atomic weight (in g/mol).