1.The distance between the points P(3,2,−4)P(3,2,-4) and Q(−1,2,3)Q(-1,2,3) is: 2.Write an equation of a sphere if one o

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1.The distance between thepoints P(3,2,−4)P(3,2,-4) and Q(−1,2,3)Q(-1,2,3) is:
2.Write an equation of a sphere if one of its diameters hasendpoints (−2,−7,6)(-2,-7,6) and (−2,−9,8)(-2,-9,8).
3.Given the points AA: (-6,2,0) and BB: (6,-3,-5),find the vector →u=−−→ABu→=AB→→uu→ = <
4.Let →a=−→i−4→j+5→ka→=-i→-4j→+5k→. Find |→a||a→|.
5.
Let →a=<−3,2,−5>a→=<-3,2,-5>. Find a unitvector in the direction of →aa→