book Maths Puzzle Numerical Ability

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:
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book Other Question

Evaluate. 5 * 4 / 2 - 4^2=

Evaluate. b^2 - 2bc + c^2 if b = 3 and c = 2. 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!