exam Maths Puzzle Numerical Ability

What are the steps in finding the values of x and d in----

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

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exam Other Question

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 A cubical container without a top is to be made from plastic. Its outer dimensions are 5cm by 5cm by 5cm and the walls and the bottom are .25 cm thick. Find the volume of plastic used to make the container, to the nearest cubic cm.