book Maths Puzzle Numerical Ability

I am needing help with the following problem please:
Evaluate 2x(squared)(Y+Z) where X=2, Y=3 Z=4

I got 15 but I am second guessing myself and wanted to see if I worked the problem correctly. Thanks for your help...

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book Other Question

If you divide a iron rod that is 10m long into three equal pieces, what will be the length of each pieces? And if it wheighs 10kg and is equally divided into three pieces, what will be the weight of each piece? An Earthquake measure 6.3 on the richter scale. Find the magintude of this earthquake.