book Maths Puzzle Numerical Ability

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

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

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book Other Question

The sum of three numbers is 66. The second number is twice the first and six less than the third. Find the numbers 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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