exam Maths Puzzle Numerical Ability

4(7n)=4 I need help deciding which property it is my choices is Multiplicative, Multiplicative Inverse, Subsitution
thanks

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exam Other Question

1 3 0 1 0
2 -1 4 x 4 -1
0 -2 1 2 1

I can't get this to look right. It is a 3x3 mul by a 3x2
Perform indicated operation. Maybe you can help me und Is the following trinomial a perfect square?
x^2 - 14x + 49