exam Maths Puzzle Numerical Ability

How many distinct triangles can be constructed by choosing three vertices from among the corners of a unit cube? And among these triangles, how many distinct(non-congruent) triangl

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How do I solve
10x^2-16x+6=0

thank you I can solve the Pyramid puzzel to a point

A = 44 All the answers are right except B + D which needs to = 129

B = 44 A+ B = 88, B + C = 102 , C + D = 119, A + D