book Maths Puzzle Numerical Ability

how do slove this problem? -(-14)+2

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book Other Question

The volume of a cube is given by V = s^3. Find the length of a side of a cube if the Volume is 729 cm^3. Locate the foci with this equation:

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

KEY:
*= squared. (EX: 5squared)