book Maths Puzzle Numerical Ability

Could you help me with this problem, please.

3^x2 =8

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book Other Question

Locate the foci with this equation:

(x-5)*/5* + (y-3)*/10*

KEY:
*= squared. (EX: 5squared)
A piece of rope 60 meters long is cut into two pieces so that the longest piece is twice as shorter. How long are the two pieces?