Answer to Question #59202 in Analytic Geometry for RITA

Question

7 Find a unit vector parallel to the resultant vector A1=2i+4j−5k, A2=1+2j+3k
8 Given the scalar defined by ϕ(x,y,z)=3x2z−xy2+5,find ϕ at the points (-1,-2,-3)
9 The following forces act on a particle P:F1=2i+3j−5k, F2=−5i+j+3k,F3=i−2j+4k,F4=4i−3j−2k, Find the magnitude of the resultant
10 If a and b are non-collinear vectors and A=(x+y)a+(2x+y+1)b