book Maths Puzzle Numerical Ability

DIFFERENCIATION:
IF Y=1/1+X,SHOW THAT
(1+X)d2y/dx2+2dy/dx=0

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book Other Question

a) Find the radii of the circles x^2 + y^2 = 2 and (x-3)^2 + (y-3)^2 = 32
b) Find the distance between the centers of the circles
c) Explain why the circles must be internally tangent You need .3 mg You already have 0.2g/300g of powder. How much powder of you need to make that .3mg?