book Maths Puzzle Numerical Ability

Working on a Geometry crossword puzzle I am stuck on the last one!

Clue: the part of the shape it sits on

Answer: 4 letters -- 3rd letter is an s

Please help!

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book Other Question

Need Help please!
2) Use the geometric sequence of numbers 1, 3, 9, 27, � to find the following:
a) What is r, the ratio between 2 consecutive terms?
Answer:
Show work in th Find an orthogonal basis of the following subspace L = span (v1,v2,v3), where v1=(0,0,1,1), v2=(1,0,1,0), v3=(0,1,-1,-1)