book Maths Puzzle Numerical Ability

Hi, could you please help me with this problem. No it's not a gambling problem.

How many possible ways could I choose a box trifecta from a race of 8 entrants. (To do this I mus

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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 If the graph of a system of equations is one line, then the system has how many solution(s).

thanks for your help!