book Maths Puzzle Numerical Ability

1.factor completely (5x^2+14x+13)^2-16((x^2+x-2)^2
2.factor out x^3+x^4y^4+y^6
3.a square has a perimeter of 12x+28cm.find its area.
4.a circle has a radius of 3x-5cm.find its a

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In a science course, you must average 89 for an A. your first three tests were 75,95,91. If you only have one test remaining, what score do you need for an A?

two more please:
Hi, could you show me how to sovle this math problem:

[5 -2 -1] . [-4 2]
[8 0 3] [1 0]