exam Maths Puzzle Numerical Ability

I tried to do this three times, but get lost in all the steps. Can you help me?

C(10,5)x C(15,8)
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C(12,11)

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exam Other Question

Can someone please help me out with this: I am supposed to find the length x. Express your answer in simplified radical form. the triangle is 51 ft on one side, 45 ft on the other side, then there is x. What is the next term in the pattern? square root of 2952, sqare root of 5248, square root of 8200, square root of 11808, square root of 16072,...