exam Maths Puzzle Numerical Ability

Could someone please help me with this i forgot how you get the perimeter of a triangle.
Side 1 = 4
Side 2 = sqrt 5 - sqrt 3
Side 3 = sqrt 5 + sqrt 3

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exam Other Question

I have a question. I am supposed to find the GCF of each product.

(6y^2 - 3y) (y + 7)

I got 3y (3y + 7) when I worked it out but I am not showing a GCF could you please help me with this problem? Thanks Describe what the graph of interval [-4,10] looks like.