exam Maths Puzzle Numerical Ability

Compute this product, I'm not sure what section of algebra this falls under and the parenthesis cover all the numbers
[0 -3 1]
5 -1 0 [1 2]
0 1
1 -1

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exam Other Question

An airplane travels 260 miles per hour into a 50 mile per hour head wind. On the return trip the wind has slowed to 25 miles per hour and the plane averages 335 miles per hour. How fast would the plane have gone with no wind on either leg?
What are the steps in finding the values of x and d in----

110x + d = 110 and 95x + d = o