book Maths Puzzle Numerical Ability

a> IS it possible to have proj(a)u=Proj(u)a? explain the reasoning
b> if u is not equal to 0, is it valid ti cancel u from both sides of the equation u*v=u*w and conclude that v=w

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book Other Question
Determine Slope. A man decends 1800 feet of elevation @ 3.25 miles horizontally away from the top of the mountain. What is the slope of decent find four consecutive integers such that the sum of the second and fourth is 57.